CCleaner (Crap Cleaner)

CCleaner is a freeware system optimization, privacy and cleaning 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. Additionally it contains a fully featured registry cleaner. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware!

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: Firefox, Opera, 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.
  
• Windows Startup tool.
  

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