CCleaner - Clean and Optimize Your Computer

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! :)

CCleaner has four main sections which can be selected using the 4 icons in the left-hand navigation panel.
(The Cleaner section is selected by default.)

Cleaner
This is the main feature of the program, which will allow you to optimize your system, by removing unused and temporary files. It also protects your personal privacy by removing traces of the websites you have visited and the files you have opened.
(It's important to point out that it does this without removing any files you'll still need!)

Registry
This is a more advanced feature which analyses your computers registry (where windows system settings are stored) and fixes any problems and inconsistencies that exist.

Tools
This section allows you to manage installed programs and applications that run when you turn on your computer.

Options
The Options section handles a wide array of preferences for how CCleaner runs.