Hi,
I found this programme on the net and after reading reviews I decided to down load it and glad I did as it has solved a lot of my computer problems.
It's called Advanced System Care FREE from http://www.iobit.com
It diagnoses your computer for system optimization, cleans junk, repairs the registry plus lots more all in one package and best of all its FREE!!!!
Just though I would add I am not associated with this company, I just thought it would be good to share.