Try this if you can find a point before you ran the registry cleaner. If you started this yesterday pick a restore point 3-4 days ago. System Restore
Please leave the registry cleaners for Win XP in the future. Sorry but I think that is the worst thing you can do to Win 7.
If that doesn't work I hope you have your Win 7 disk.
This will repair the registry and defaults of Windows and the registry WITHOUT
removing your personal files, pictures and folders. Repair Install
Delete the Stopzilla that is not working properly.