Windows has a built-in tool (Disk Cleanup) for cleaning up hidden junk files. Click Start > File Explorer > This PC (Windows 10). Right-click your main hard. We're keepin' your PC clean · One-click Clean and Tune-up. Cleans junk files and unneeded registry entries to improve the performance of your PC by one simple. The best CleanMyPC alternatives are BleachBit, CCleaner and Glary protect online privacy, and more' and is a System Cleaner in the OS.
You can watch a thematic videoHow to Remove Viruses From Your Computer
Clean my pc online -
Suite of utilities for cleaning disk and operating system environment
CCleaner (, originally Crap Cleaner), developed by Piriform (a company acquired by Avast in 2017), is a utility used to clean potentially unwanted files and invalid Windows Registry entries from a computer. It is one of the longest-established system cleaners, first launched in 2004. It was originally developed for Microsoft Windows only, but in 2012, a macOS version was released. An Android version was released in 2014.
CCleaner has been reviewed by Chip.de,TechRadar,PC Magazine, and TechRepublic.
CCleaner can delete potentially unwanted files left by certain programs, including Microsoft Edge, Internet Explorer, Firefox, Google Chrome, Opera, Safari, Windows Media Player, eMule, Google Toolbar, Netscape, Microsoft Office, Nero, Adobe Acrobat, McAfee, Adobe Flash Player, Sun Java, WinRAR, WinAce, WinZip and GIMP along with browsing history, cookies, recycle bin, memory dumps, file fragments, log files, system caches, application data, autocomplete form history, and various other data. The program includes a registry cleaner to locate and correct problems in the Windows registry, such as missing references to shared DLLs, unused registration entries for file extensions, and missing references to application paths. CCleaner 2.27 and later can wipe the MFT free space of a drive, or the entire drive.
CCleaner can uninstall programs or modify the list of programs that execute on startup. Since version 2.19, CCleaner can delete Windows System Restore points. CCleaner can also automatically update installed programs and computer drivers. 
CCleaner also has its own web browser called CCleaner Browser. CCleaner Browser is included to optionally install in the CCleaner installer, but it can also be installed from its website. CCleaner Browser avoids advertising, avoids tracking, has built-in security against all kinds of malware, phishing, malicious downloads, and also avoids unwanted elements such as pop-ups or excessive browser cache. The browser is only available for Microsoft Windows.
CCleaner was first launched in 2004 for Microsoft Windows. It remained a Windows-only utility until 2012. On 2 June 2011, Piriform announced a public beta test program for CCleaner for Mac. The Mac version graduated to the test stage on 30 January 2012.
A commercial Network Edition was also introduced. Piriform released CCleaner for Android in 2014.
CNET editors gave the application a rating of 5/5 stars, calling it a 'must-have tool'. It was awarded Editor's Choice Award in April 2009 by CNET. In 2016 Piriform announced 2 billion CCleaner downloads worldwide. In January 2014 it had been the most popular software on FileHippo for more than a year, and had a 5-star editor's rating on download.zone and Softpedia. CCleaner has been reviewed by Chip.de,TechRadar,PC Magazine and TechRepublic.
Upon an error in the code, the Active Monitoring component of CCleaner 5.45, which was designed to measure junk levels to trigger cleaning, switched back on again. Piriform recognized this error and confirmed to users that the Active Monitoring feature did not report data. It then changed Active Monitoring to the more accurate title of 'Smart Cleaning'. After criticism later versions allowed data collection to be controlled separately by the user, although some data collection, such as OS and language, which is necessary for the app to be delivered, is still on by default as outlined in the company's Data Factsheet. Piriform states that the data collection is completely anonymous and is used to improve product quality. 
In December 2018, it was reported that users installing CCleaner would also have Avast Antivirus installed without their permission, with TechSpot claiming this arguably made CCleaner no better than the malware it was supposed to defend against. Piriform denied this.
In July 2020, Microsoft Windows Defender began flagging the free version of CCleaner as a "potentially unwanted application", stating that "while the bundled applications themselves are legitimate, bundling of software, especially products from other providers, can result in unexpected software activity that can negatively impact user experiences." Piriform rolled out an update days later and third-party software installation is now optional when installing the program.
After Piriform was acquired by Avast, in September 2017, CCleaner 5.33 was compromised by the incorporation into the distributed program of the Floxif trojan horse that could install a backdoor, enabling remote access to 2.27 million infected machines. Avast reported that the malware was already in CCleaner version 5.33, prior to the purchase of Piriform. Forty of the infected machines received a second-stage payload that appears to have targeted technology companies Samsung, Sony, Asus, Intel, VMWare, O2, Singtel, Gauselmann, Dyn, Chunghwa and Fujitsu. On 13 September, Piriform released CCleaner 5.34 and CCleaner Cloud 1.07.3191, without the malicious code.
On 21 October 2019, Avast disclosed a second security breach during which attackers tried again to insert malware inside CCleaner releases. That attempt was unsuccessful.
- ^"CCleaner 5.86.9258". piriform.com. Piriform. 20 October 2021. Retrieved 20 October 2021.
- ^"CCleaner for Mac v1.18.30". piriform.com. Piriform. 5 October 2020. Retrieved 25 March 2021.
- ^"CCleaner: Cache Cleaner, Phone Booster, Optimizer". Google Play Store.
- ^ ab"What operating systems does CCleaner support?". CCleaner - FAQ. Piriform. Retrieved 5 November 2010.
- ^"Changing the language CCleaner uses". CCleaner Documentation. Piriform Ltd. Retrieved 26 October 2018.
- ^"Why do I see a message that says 'CCleaner Free is for home use only' or 'CCleaner Free is not free for commercial use?'". Piriform. Retrieved 17 October 2019.
- ^"CCleaner". 6 June 2004. Archived from the original on 6 June 2004. Retrieved 22 September 2017.
- ^ abNakodari. "10 Lessons Software Developers Should Learn From CCleaner's Success". Addictive Tips. Retrieved 25 May 2016.
- ^"CCleaner - Optimization and Cleaning - Free Download". Ccleaner.com. Archived from the original on 25 January 2018. Retrieved 26 October 2011.
- ^ ab"CCleaner". chip.de. Retrieved 21 February 2016.
- ^"Download of the Day: CCleaner". techradar.com. Archived from the original on 2 March 2016. Retrieved 21 February 2016.
- ^"CCleaner (for Mac) Review & Rating". pcmag.com. Retrieved 21 February 2016.
- ^ ab"Five Tips For Using CCleaner To Degunk Your System". techrepublic.com. Retrieved 21 February 2016.
- ^ ab"CCleaner - Features". Official web site. Piriform. Retrieved 3 June 2010.
- ^"Tuning Windows: Less Bull, More Speed". 20 May 2009. Archived from the original on 16 July 2012. Retrieved 2 June 2009.
- ^"Screenshot #5: The Startup Tool". Official web site. Piriform. Archived from the original on 29 October 2010. Retrieved 5 November 2010.
- ^"CCleaner Version History". Official web site. Piriform. 26 March 2013. Retrieved 26 March 2013.
- ^"Screenshot #6: The System Restore tool". Official web site. Piriform. Archived from the original on 2 November 2010. Retrieved 5 November 2010.
- ^"CCleaner for Mac [Beta] Released". ccleaner.com. 2 June 2011.
- ^"CCleaner for Mac v1.01". ccleaner.com. 30 January 2012. Archived from the original on 20 July 2019. Retrieved 20 July 2019.
- ^Ferri-Benedetti, Fabrizio (18 April 2014). "CCleaner for Android: too little, too late?". Softonic. Retrieved 21 June 2017.
- ^Rosenblatt, Seth (28 October 2010). "CCleaner". Download.com. CBS Interactive. Retrieved 15 May 2011.
- ^Piriform, Software (3 November 2016). "Piriform Announces 2 Billion CCleaner Downloads Worldwide". prnewswire.com. PR Newswire. Retrieved 2 October 2018.
- ^Opris, Elena (7 January 2014). "CCleaner 4 Review". Softpedia.com. Retrieved 31 January 2014.
- ^"Download of the Day: CCleaner". techradar.com. Archived from the original on 2 March 2016. Retrieved 21 February 2016.
- ^"CCleaner (for Mac ) Review & Rating". pcmag.com. Retrieved 21 February 2016.
- ^Milena Dimitrova (3 August 2018). "CCleaner v5.45 Introduces Data Collection with No Way to Opt-Out". Sensors Tech Forum. Retrieved 14 October 2018.
- ^"CCleaner v5.46.6652". CCleaner.com. 30 August 2018. Retrieved 14 October 2018.
- ^Osborne, Charlie. "CCleaner provokes fury over Active Monitoring, user data collection". ZDNet. Retrieved 28 June 2019.
- ^"I'm using CCleaner v5.45. Why is Active Monitoring still on when I have switched it off?". Piriform Support. 8 October 2018. Retrieved 14 October 2018.
- ^David Matthews (19 December 2018). "CCleaner may be installing Avast anti-virus without your permission". TechSpot. Retrieved 20 January 2019.
- ^"Windows Defender is flagging CCleaner as a Potentially Unwanted Application". TechSpot. Retrieved 5 August 2020.
- ^Warren, Tom (18 September 2017). "Hackers hid malware in CCleaner software". The Verge.
- ^"CCleanup: A Vast Number of Machines at Risk". blog.talosintelligence.com. Retrieved 21 September 2017.
- ^"Hackers compromised free CCleaner software, Avast's Piriform says". 18 September 2017. Retrieved 22 September 2017 – via Reuters.
- ^Dan Goodin (25 September 2017). "CCleaner backdoor infecting millions delivered mystery payload to 40 PCs". Ars Technica.
- ^"Foreign Economic Espionage in Cyberspace"(PDF). CIA. 24 July 2018.
- ^Rubenking, By Jeffrey L. Wilson and Neil J.; September 19, 2017 3:15PM EST; September 19, 2017. "CCleaner Professional Plus". PCMAG.CS1 maint: numeric names: authors list (link)
- ^Cimpanu, Catalin. "Avast says hackers breached internal network through compromised VPN profile". ZDNet. Retrieved 21 October 2019.
Simple cleaning when you need it, or fully automated PC maintenance?
See which version of CCleaner suits you:
Our standard version frees up space, clears your online tracks and helps you manage your machine so it runs faster.
Standard privacy protection
not included: Driver Updater
not included: Complete PC Health Check
not included: Software Updater
not included: Complete cleaning
not included: Keeps your browsing history private
not included: Detects and removes internet trackers
not included: Keeps you from running out of space
not included: Priority customer support
Our best-ever version combines all the features of Free with the power of automation, so your PC always stays clean, safe and fast.
Standard privacy protection
Complete PC Health Check
- Updates apps to reduce security risksi
Keeps your browsing history private
Detects and removes internet trackers
Keeps you from running out of space
Priority customer support
Was GBP 0Now GBP 24.95£24.95
cleaned every month
desktop installs per week
We asked Passmark, a third-party software testing specialist, to put CCleaner through its paces
The results showed that using CCleaner:
- Recovers 4GB of space initially (and 34GB a year!)
- Gives PCs 28% more free RAM
- Makes PCs boot 53% faster
Faster startup, better performance, and more room for what really matters
I was having computer issues and didn't know what to do. My friend recommended MyCleanPC so, I gave them a try for my personal Mac laptop that was suffering from a bad hard drive. The company had great reviews, the prices were reasonable, but I was really worried since I had not used this service before. The technician quickly responded to all my emails and clearly explained what he was doing during the remote session with my computer. My laptop is running better than ever now thanks to this company!
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I spun up a new virtual instance of Windows 10 Pro and fully patched the OS. With no other changes I went to MyCleanPC and installed the app. It claimed I had junk files and spyware slowing down a pristine, new instance of Windows 10. This app may help an older and/or infected PC. But I wouldn't trust this company or its app.
The techs that I have talked to or chatted with have been courteous and professional in all ways and have provided me with great service. They explained how my problem arose and what needed to be done to prevent it in the future. Very good customer support!
I loved the ease of use and especially how it made my computer faster. Most software doesn't deliver as promised but MyCleanPC definitely delivered on its promise. Thank you for that! I will be sure to keep a look out for more great products from this company.
I am pleased that my problem is fixed. The technician was very polite and I appreciate your service. Before this my PC was running very slow and sometimes very hard to get to the webpage I was looking for. Thanks so much.
David helped me figure out how to transfer our family tree from a 2019 Microsoft version of Family Tree Maker to our 2019 Mac version. He was very professional. Analyzed the problem quickly and gave me a solution within 5 min.
Ravi was very professional and knew exactly what to do to get the software installed and running. Very good experience with Ravi. My computer now runs much faster and I can hardly wait to get back to finishing my work on the PC.
Tech ran free trial for me. To show me what My Clean would do for my old computer. At this time I was unable to purchase this as I am retired on set budget. Thank you for showing me this and hopefully I can see about buying this service in the future.
Company is very useful. Computer was very slow, Josh fixed the unwanted programs, helped with a few programs I work with. Fixed in record time. Fixed my Google program, much easier to use. He fixed the ads that I did not want. Very Helpful. Thank You MyClean PC.
This has been a great experience, I hope it continues!! My PC runs and performs much better, much faster. I has a good experience with your Tech support. I will recommend this product to all my friends. Thank So You!!
Wisecare 365 will do most of the work for you. It will clean up your PC by deleting temporary files, unwanted junk and other stuff wasting space on your PC.
You will begin with Fsecure. This software will clean up a virus and any other threats on your PC. It will clear the way for you to start work on the clearing out the system.
Once you have cleaned out the system, you will install Avast antivirus which will protect your PC from any future threats that the internet has to offer
What is a Virus?
A virus will disguise itself as a real program. Viruses are often rewritten and altered so that they cannot be detected. Anti-virus programs and their definitions must be updated regularly to look for new and re-written viruses. Viruses are a parasite, programs that are written to enter a computer without the user's knowledge. The word parasite is used because a virus attaches to files and replicates itself, and thus continues to spread through the infected system. Some viruses can cause serious damage and slow down system performance. clean my pc will rid any infection on your computer.
I think computer viruses should count as life. I think it says something about human nature that the only form of life we have created so far is purely destructive. We've created life in our own image: Stephen Hawking
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What is a Trojan?
A program which has harmful code is hidden inside another program. When the program is executed, the Trojan performs a certain task, mostly working towards staying on the computer. Trojans allow hackers to open back doors on a computer, giving them access to your system and even network. A program is hidden away in a legitimate program. A Trojan carries viruses that may be harmful to your computer once you run the program where the Trojan is hidden.
After all, one Trojan on a computer is one too many: Glenn Turner.
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What is Spyware?
Some Web sites track users' online activity through the use of what is known as spyware', usually coming in the form of cookies', they enable the cookie writer to gather information about what you are doing and which websites you are visiting. There is software available which detect and delete spyware. They gather information about a person without their knowing about it. Spyware is programs that are installed into someone's computer to secretly gather data about the person and send that information to advertisers.
One of the most feared expressions in modern times is 'The computer is down: Norman Ralph Augustine
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What is Adware?
Software that is installed onto your computer by a remote site. Some free programs that you download will install hidden software that transmits information about the websites you visit and other information from your computer to advertisers so they can target you with spam and pop up advertising. Although not malware, adware goes much further than reasonable advertising. A separate piece of code designed to be installed when other shareware or free applications are installed, adware continues to advertise even when the originally desired program is not executing.
"The only truly computer is one that is powered off, cast in a block of concrete and sealed in a lead-lined room with armed guards": Gene Spafford
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A bit about specific Viruses, Trojan horses and worms etc that clean my pc will protect you from.
A Windows system infected by the Code Red virus locks out the user, because the worm creates a backdoor into the computer's operating system, allowing a remote user to access and control the machine. In computing terms, this is an exploit. It’s not good for the computer's owner. .
The hacker controlling the virus can access information from the victim's system or even use the infected computer to steal personal information such as passwords, banking details etc. That means the victim not only has to deal with an infected computer, but also may fall under suspicion for crimes he or she didn't commit.
Confiker is a computer worm and is supposed to be one of the most widespread viruses. Also known as Kido, Downup and Downadup. It first appeared in October of 2008 and infected 10 to 15 million systems worldwide. It infected the systems used by the House of Commons, the ministry of defence and hospitals. The usual evidence of being infected with this virus is slow browsing, it also prevents the running of anti-virus applications making it very difficult to remove.
The virus hangs about in the system doing nothing but is triggered on certain events such as April fools day.
I Love You
Is probably the computer virus that is the deadliest. Created by two Filipino programmers Reonel Ramones and Onel de Guzman All around the globe, this was a virus that was truly a dangerous and destructive infection affecting a large number of systems. It contaminated more than ten million Windows systems by 4 May 2000.
I Love You began as a message in an email with the attachment “LOVE-LETTER-FOR-YOU.txt.vbs“. Millions of systems ended up being damaged by this virus that is resulted in a cost of approximately 10 billion pounds. It infected 10% of the computers of the world’s biggest companies.
David L. Smith created this virus in March 1999. It infected word documents and Outlook and was passed around as email attachments. These attachments usual contained a list of passwords to adult websites. It is estimated that the cost of this virus was around the 80 million pounds mark. The email contained the title "Important Message From and usually a friends email accounts name. When the email message was clicked the body shows: "Here's the document you asked for. Do not show anyone else )".
The attachment was titled “list” and had the .doc extension. List.doc showed a list of adult sites with login details. Melissa then mailed itself to 50 friends or colleagues on the host email list. Smith was arrested due to efforts made by the FBI, Monmouth internet and N.J. Police state. He pleaded guilty to writing the virus and sentenced to 20 months in prison along with a fine of £5000
18 year-old German Sven Jaschan was arrested in May 2004 for releasing the worm on his 18th birthday in 2004. Microsoft offered a bounty of £250,000 for information leading to the arrest of Jaschan. One of his friends told Microsoft that Jaschan had written the worm and also Netsky.AC, another variant. Sasser.E was infecting systems around the globe after he was arrested.
Typical indications of infection are files on the systems hard drive named C:\win.log, C:\win2.log. 100% central processing unit running at 1005 as well where the PC would crash due to the file transfer protocol software running randomly. Jaschan created the worm before his 18th birthday, this meant the German courts could only try him as a minor. He was found guilty of committing computer sabotage and altering information held on the system. He was sentenced to 21 months suspended.
Zeus is a Trojan horse, a malicious piece of software that infects the Windows operating system. It was first detected in 2007 and its primary goal was to steal banking details. Also known as Zbot, it infected millions of systems across the world. Zeus creates a “botnet” which is a network of infected systems, it is a keylogger which spies on a users input to the keyboard.
This Trojan horse can infect mobile phones which is why companies are moving forward to two-factor authentication. Billions of pounds were lost to this malicious software that stole banking details from users infected machines. The way Zeus infected machines was by phishing, a type of email or website created to look like the real sight. Cisco, Amazon and Oracle were targeted in particular. Over 100 hackers were responsible for stealing 80 million pounds.
Microsoft continually release updates for Windows which incorporate patches to deal with a lot of these nasties however, pirated versions of windows will not be able to install these patches so, if you are running a legal version of Windows, be sure to get the regular updates and install them to give you further protection.
Watch a video showing computers sending cyber threats across the globe.
This is a video of cyber attacks which are taking place all over the world at any given time, night or day. Below you will see a visual representation of such attacks. The yellow boxes are the attackers and the green circles are the victims. Occasionally you will see an orange trajectory, this is an attack known as an APT or better known as Advanced Persistent Threats.
It is a fairly new threat that targets Linux servers which once installed, will take control of a command server and then have the ability to edit, delete, move files on the system. This visualisation was taken on Friday 23rd April 2021. You can see the timestamp on the right-hand side of the window which also shows the number of attacks that have taken place that day.
As you can see, cyber crime exists and is a real threat to businesses where they attack important servers and also, individuals in their own homes.See live version
Arctic Wolf is a cyber security business who provide security solutions for small and mid-sized businesses to detect and act on cyber crime. This company is a major player in this area and will obviously charge big money for their services. Following the clean my pc for free step by step guide will protect your PC and home network just like Artic Wolf but using software called Fsecure and Avast antivirus which are free.
Your PC is sluggish and slow, sometimes even crashes!
You may not know that there is a Virus in your system!
Companies are spying on every move you make on the internet!
Your Notepad, Laptop etc. will be using valuable rescources such as battery power!
What is the point of the clean my pc for free website?
Firstly, a bit about me Clive Jackson, designer of clean my pc for free. I have been in the computer game since the late '80s. I was out of work and had to find a hobby to fill my time whilst job hunting. The local library had the answer. I found up a book “how to build a computer”. At first thoughts, it was quite daunting. I, at that time, didn’t have a P.C. as we now know it.
I was the proud owner of an Amstrad colour personal computer 64 which had a tiny memory of 64 kilobytes, that’s not megabytes! When eventually I got my first P.C. it was what is known as a “bare-bones system”.
What does this mean? Well, since the system is sold as a pre-built unit, with the motherboard and power supply already installed, it was the cheaper option to build your own.
A Barebones System.
After purchasing the necessary parts such as the CD-ROM, hard drive etc. I was pleased to strike it up for the first time and see my new creation alive! The problem is you need to continually upgrade and update. Processors were slow and needed upgrading to a faster specification.
Next was to install the operating system which in those days was Microsoft DOS which came on three floppy disks 4MB each. Listening for the DOS beeps was crucial as you had no user interface to see what went wrong if anything.
Once DOS was in, it was time to install windows. At that time, it was windows 3.1 which came with 7 floppy disks if I remember correctly. Windows would load the welcome screen, deep joy!
Microsoft DOS disks.
Next was the awkward step of installing a modem (modulator-demodulator) to connect to the internet. Sometimes an absolute nightmare. My ISP at that time was Freeserve dial-up.
This was an internet connection that you could not access until 6 pm in the evening, wow, those were the days! Firstly, you had to install the drivers which came on CD-ROM. Pretty straight forward nowadays but, back then a nightmare!
If you could not afford an Anti-virus then, you were at the mercy of the bad guys out there. Many times I had to re-install the system from scratch as there was no imaging as such and, what was out there was very expensive and, no back-up, restore like we have today. Because I had self-taught all this stuff, I was at the mercy of my friends whose own system had crashed. They wanted me to repair their PC’s which then, I did for free. It took many, many hours of my time and, to be honest, became quite annoying.
One day I decided to write down on paper a step by step guide for them to follow to repair their PC. Yes, I did get many telephone calls asking for help but, I was happy to do that. One day it dawned on me that, if I designed a website to help clear out people’s PC’s, it would be such a great help to them and to help the rest of the world do the same. This is where I came up with this site… clean my pc for free. I hope you can make use of it, to increase the security, performance, speed etc. of your own machine.