CCleaner is a freeware PC optimization tool. It combines a system cleaner that removes unused and temporary files from your system and also a fully featured registry cleaner. CCleaner allows Windows to run faster, more efficiently and gives you more hard disk space and the best part is that it’s Small, Fast and Free.

Cleans:

  • Cleans Windows components (IE, Firefox, Run history, Search Assistant history…)
  • Application Cleaning (Firefox, Opera, Safari, Media Player, eMule, Kazaa, Google Toolbar…)
  • Registry Cleaning
  • Advanced Options (Tray Notifications Cache, User Assist history, Custom Folders…)

http://www.ccleaner.com