The Windows optimizing tool CCleaner removes unneeded files and registry entries for a faster, more efficient PC. It also functions as a privacy enhancement tool by clearing out the browser cache, internet history, and other internet tracks. CCleaner is free for anyone to download and use. Those who find the program useful are encouraged to make a donation.

CCleaner has a number of checks and balances to ensure the safety of valuable files and information that should not be deleted. The registry cleaner is reportedly more cautious than powerful to prevent unwanted losses that might damage computer function.

CCleaner does more than tidy up Windows System files. It also removes temporary files from a host of other programs including Media Player, Kazaa, Google Toolbar, Microsoft Office, WinZip, and Acrobat. CCleaner also helps users manage their Windows start up files so the computer will fire up more quickly, and it can be used to repair errors in the Add/Remove Programs list.

CCleaner has a CNET user rating of 4.5. Some users have reported clearing several gigabites of hard drive space with a single three minute use of the program.

1. Browser cache, history and cookies
2. Ckdsk fragments
3. Log files
4. Post-crash memory dumps
5. Recent documents list
6. Recycle bin
7. Run history
8. Temporary files
9. Windows XP search history
10. Clipboard
11. Menu order, tray notifications and window size cache
12. User assist historybeta/s1t3r