Consider downloading the free to use ccleaner. I've been using it for more than a year. The website says:
Cleans the following
Internet Explorer
Temporary files, URL history, cookies, Autocomplete form history, index.dat.
Firefox
Temporary files, URL history, cookies, download history.
Windows
Recycle Bin, Recent Documents, Temporary files and Log files.
Registry cleaner
Advanced 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 applications
Removes 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 FREE
This software does NOT contain any Spyware, Adware or Viruses.
Caution! careful how you clean your dll's - in fact, it's best to leave that bit alone, so don't touch it. The website is:
http://www.ccleaner.com/