Registry Distiller (Free)
Registry Distiller is free, it cleans and optimizes your computer by removing obsolete and incorrect information from the registry. A cluttered registry implies slow performance and possible crashes. This fast cleaner will find and repair any errors resulting in a faster computer with fewer crashes.
It will find and let you optionally remove orphaned references from uninstall, add/remove programs, shared dlls, custom controls, startup programs and much more. A registry backup will be made before any removal in conducted.
Registry Distiller is Windows NT/2000/XP/2003/Vista compatible.
If you like Registry Distiller and got a couple of bucks going spare, please consider donating me for the effort
I am very happy to see a 5-star rating of the beta version!