CCleaner is a freeware system optimization and privacy tool. This tool can 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 such as: Temporary files, URL history, cookies, download history, autocomplete form history, index.dat.
This tool also can used as Registry cleaner like 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.
But the best part is that it’s fast (normally taking less than a second to run) and contains NO Spyware or Adware! 
CCleaner v2.07
- Firefox 3.0 support added.
- Fixed bug where figures were missing for KB/MB sizes.
- Fixed bug where some IE cookies were being missed.
- Improved scan time accuracy.
- Internal memory management improvements.
- Registry settings moved to HKCU\Software\Piriform\CCleaner.
- Fixed bug where CC could get locked in System Tray.
- Renamed MSN Messenger to Windows Live Messenger.
- Added MS Office Picture Manager to applications.
- Fixed uninstaller tool bug on 64-bit OS.
- Minor GUI improvements.
- Minor bug fixes.
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