Sounds like we should really keep away from those "registry cleanres"
LOL - yep, I keep saying stay away from the registry cleaners ...
Guess what ... I used "Scan for issues" and thought 'well so long as I back up any registry entries I fix it should all be OK' - guess what .... 'I was wrong'. Having 'fixed' the issues present (and backing up the registry) my system never started again and Windows repair didn't work. A lot of use my 'repair' backups were eh?
My advice stands again ... "Don't use registry cleaners" - I have learned my lesson and I won't do it again, at least not without a full disk image backup first.
Luckily my backup was only a wcouple of weeks old so Acronis TrueImage restored my system back to working order, and all my data is stored off the system disc so there wasn't much data to recover before doing a system restore.