CCleaner.exe

CCleaner is designed to optimize and to clean the system.
The software removes unused files from your hard drives, shortcuts without a target, ActiveX controls, help files, registry entries, etc. to free up space and improve Windows loads. CCleaner is also able to erase all traces of your web browsing within seconds. The application deletes temporary files, history of visited websites, cookies, forms, etc. CCleaner supports Internet Explorer, Opera and Mozilla Firefox. Finally, the program can remove the temporary documents numerous applications such as eMule, Kazaa, Google Toolbar, Office, Nero, Adobe Acrobat, WinRAR, etc. This new version supports 64-bit (source: 01net.com).