CCleaner is a system optimization, privacy and cleaning 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. CCleaner can clean unneeded files from various programs saving you hard disk space, remove unneeded entries in the Windows Registry, help you uninstall software and select which programs start with Windows. Additionally it contains a fully featured registry cleaner.