CCleaner
CCleaner is a freeware 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! :)
For more information, visit,
http://www.ccleaner.com/