What better tool than
CCleaner.
CCleaner is a freeware system optimization and privacy 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. But the best part is that it's fast (normally taking less that a second to run) and contains NO Spyware or Adware! :)
As far as my experience goes this Application does not crash your system yet it removes a lot of junk which you may not be sure of .
Free worth = 9/10
Ease of Use = 8/10
Technical Functionality = 9/10
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My Appz Recomendation = does what it says!
Download -> http://www.ccleaner.com/ccdownload.asp
Cleans the following: Internet ExplorerTemporary files, URL history, cookies, Autocomplete form history, index.dat.
FirefoxTemporary files, URL history, cookies, download history.
WindowsRecycle Bin, Recent Documents, Temporary files and Log files.
Registry cleanerAdvanced features 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... also comes with a comprehensive backup feature.
Third-party applicationsRemoves temp files and recent file lists (MRUs) from many apps including Opera, Media Player, eMule, Kazaa, Google Toolbar, Netscape, MS Office, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and many more...
100% Spyware FREEThis software does NOT contain any Spyware, Adware or Viruses.