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[Andavari]

First start by reading the official documentation for solutions to install problems.

Other possible solutions when CCleaner won't install:

• Make sure the installer isn't named CCleaner.exe, if it is rename it to something else like: ccsetup232.exe
• Exit running programs that may interfere, or temporarily disable them.
• Make sure CCleaner isn't already running to find out if it is; Open Task Manager to see if CCleaner.exe is in the list of running processes.
• Reboot your computer.
• If the above attempts fail download the Portable version of CCleaner, then unzip it to use CCleaner - you can even unzip it into the folder where an older version of CCleaner is installed to update it.
• If downloading CCleaner fails which some people have reported please try a different web browser to download CCleaner. You may even need to clear out your browser cache ("Temporary Internet Files").
• If after trying everything listed above you're still having issues please follow the Piriform malware removal information to find out if your system is or isn't infected.

Also Important:
To avoid rip-off versions (which could be malware in disguise) only download CCleaner from the official download sites Piriform CCleaner, or from FileHippo.com.