What is CCleaner.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the CCleaner.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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CCleaner.exe file information

Windows Task Manager with CCleaner
CCleaner.exe process in Windows Task Manager

The process belongs to software CCleaner by Piriform ( or

Description: CCleaner.exe is not essential for the Windows OS and causes relatively few problems. CCleaner.exe is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of C:\ or in the "C:\Program Files" folder. Known file sizes on Windows 10/8/7/XP are 5,489,944 bytes (7% of all occurrences), 6,602,152 bytes and 65 more variants. 
It is not a Windows system file. The file has a digital signature. It is a Verisign signed file. The program starts upon Windows startup (see Registry key: Run, MACHINE\Run). CCleaner.exe is able to monitor applications and record keyboard and mouse inputs. Therefore the technical security rating is 17% dangerous; however you should also read the user reviews.

Uninstalling this variant: If you experience any issues with installation of CCleaner.exe, you may also want to uninstall the associated program (Start > Control Panel > Uninstall a Program > CCleaner).

Recommended: Identify CCleaner.exe related errors

Important: Some malware camouflages itself as CCleaner.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the CCleaner.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Fantastic for removing CRAP off your PC.. I have used it for a year or so, its great.
A program used to clean your computer. A good program I might add. Search for it anywhere, you'll find it anywhere...
  General Leo  
FREE cleaner/ no ads/just a basic program.
This is a Great program for removing garbage(Cookies) from your computer . It's Free, Small in size and Fast. Works better than other cleaning programs that I've used.
    (further information)
Great program for removing junk off your system. It is also good at revealing installed programs you didn't know were installed as well as directories & files you didn't know existed.
  Vagrin   (further information)
Fantastic Program for removing unused files and giving your pc a boost completly safe
  Diego H.  
HARMLESS ~ Tripple scanned for Virus/Troj=None
I used it along of years without problem but recently update intall a monitoring program that interfer with the starting of several programs. I must desactivate it.

Rating chart

Summary: Average user rating of CCleaner.exe: based on 11 votes with 8 user comments. 9 users think CCleaner.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user suspects danger.

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Best practices for resolving CCleaner issues

A clean and tidy computer is the key requirement for avoiding problems with CCleaner. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the CCleaner.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

CCleaner.exe [all]