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 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. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware! :)