CCleaner - system optimisation tool
This tool is a very powerfull system cleaner. It has many categories of cleaning it does and you will have to fairly computer savy in order to use it properly. For the average user, a tool like Easy Cleaner or RegSeeker may be better.
Quote from the website http://www.spazmatic.net/partners/ccleaner/
CCleaner (Crap Cleaner) is a freeware system optimisation tool. That removes unused and temporary files from your system - allowing it to run faster, more efficiently and giving you more hard disk space. The best part is that it's fast! (normally taking less that a second to run) and Free. :)
Cleans the following:
Internet Explorer Cache, History, Cookies, Index.dat.
Recycle Bin, Temporary files and Log files.
Recently opened URLs and files.
Third-party application temp files and recent file lists (MRUs).
Including: Media Player, eMule, Kazaa, Google Toolbar, Netscape, Office XP, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and more...
Advanced Registry scanner and cleaner to remove unused and old entries.
Including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, Invalid Shortcuts and more...
Backup for registry clean.
This software is completely Freeware and contains no Spyware or Adware.