CCleaner is a system optimization and privacy tool. You can delete unused files from your system.
What can clear:
Internet Explorer Temporary files, URL history, cookies, auto-complete form history, index.dat.
Firefox Temporary files, URL history, cookies, download history.
Windows Recycle Bin, Recent Documents, Temporary files and Log files.
Registry Cleaners unused and old entries, including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, Invalid Shortcuts and more …
temporary and history files of third-party applications Opera, Media Player, eMule, Kazaa, Google Toolbar, Netscape, MS Office, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and more of