Try this one: Eusing Free Registry Cleaner: Safely scan and repair registry problems - Spyware FREE..

It's free and has plenty of good reviews and awards from several reputable sites. If you use it and need any help, print the screen and post it and I'll advise you on its' use.
I've used these before and it deleted some photos that I didn' want deleting, so if the scan comes up with any image files etc. then check the location and the file before fixing the problem.

Don't worry too much though as nearly all of these programs come with a restore option.

Regards

Martin