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.
Mike