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, cookies, cache et.

Additionally it contains a fully featured registry cleaner. 

It cleans the following software: Internet Explorer, Firefox, Google Chrome, Opera, Safari, Windows - Recycle Bin, Recent Documents, Temporary files and Log files, Registry cleaner and Third-party applications.

It is 100% Spyware and Adware FREE.

You can download a free copy at piriform.com/standard or a paid version piriform.com/ccleaner/download