CCleaner is a freeware system optimization, privacy and cleaning tool. CCleaner is the number-one tool for cleaning your Windows PC. Keep your privacy online and offline, and make your computer faster and more secure. Easy to use and a small. 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 removes 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.