ccleaner logoFrom Piriform: 

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. 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!ccleaner screenshot

Operating SystemWindows XP/Vista/7/8/10 Includes both 32-bit and 64-bit OS.