CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system, allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history.

Currently CCleaner can clean up atleast the following software: Internet Explorer, Firefox, Windows, Windows registry and a long list of 3rd party applications.

Notice! F-Secure anti-virus, Kaspersky anti-virus and possibly other anti-virus software as well, gives a false positive report on CCCleaner. For example F-Secure incorrectly detects Malware/Win32.Trojandownloader.Zlob in the installation package. The installation package is clean. You safely can use CCleaner. F-Secure and Kaspersky are aware of the problem, and have reported to fix it in a "future update".