What service pack do you have, SP3?
SP3
What security software do you run?
ESET NOD32
Is there a reason why you are trying to clean the registry, have you had a virus infection or something like that?
I was looking in there to see if there were any problems, I've done it often before but never had the black screen problems.
Have you had any other computer problems lately?
I recently had a graphics card failure but that's really all.
By the way the latest ccleaner version is 3.8. 1475
I'll update to the newer version, thanks for the help