CCleaner (Crap Cleaner) is a freeware system optimization tool. That removes unused and temporary files from your system - allowing Windows to run faster, more efficiently and giving you more hard disk space. The best part is that it's fast! (normally taking less that a second to run) and Free.

Cleans the following:
- Internet Explorer: Temporary files, URL history, cookies, Autocomplete form history, index.dat.
- Firefox: Temporary files, URL history, cookies, download history.
- Opera: Temporary files, URL history, cookies.
- 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: mRemoves temp files and recent file lists (MRUs) from many apps including Media Player, eMule, Kazaa, Google Toolbar, Netscape, MS Office, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and many more...
- 100% Spyware FREE: This software does NOT contain any Spyware, Adware or Viruses.

Changes in version 1.37.456 :
- Added support for loading/saving settings to an INI file rather than the registry.
- Added summary log for cleaning Firefox/Mozilla temporary files.
- Added file drag-and-drop support to the Custom File list.
- Improved Vista compatibility.
- Improved 64-bit OS support.
- Added filename wiping to secure deletion.
- Added cleaning for Adobe Reader 8.0, IZArc, OpenOffice 2.1, PerfectDisk 8.0.
- Updated cleaning for Nero and Flash Player.
- Several performance improvements.
- Major language translation updates.
- Minor stability improvements.
- Minor bug fixes.

Homepage - http://www.ccleaner.com

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have not happened before.. but still, im careful with wut i remove

did u backup your registry b4 cleaning your registry? if u had then u can restore it back to its original state