CCleaner is the most useful tool for cleaning your Windows PC and it makes your computer faster and more secure. It is easy to install and use. If you haven't used it yet. Then you are surely missing something very important for your computer. Give it a try, you will definitely like it.
CCleaner cleans the following:
Internet Explorer: Temporary files, URL history, cookies, Autocomplete form history, index.dat.
Firefox: Temporary files, history, cookies, download history, form history.
Google Chrome: Temporary files, history, cookies, download history, form history.
Opera: Temporary files, history, cookies.
Safari: Temporary files, history, cookies, form 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...