I've just wasted hours trying to get back into Windows after using the new Win 10 version of CCleaner to clean the registry!
My machine would get to the Dell logo and spinning wheel and sit there. I eventually left it for over an hour to no avail.
After that, Startup Fixer could not repair it so I loaded the registry editor from a command prompt and imported the backup made by CC. It imported successfully yet didn't fix a damned thing!
I'm now sitting waiting for a refresh of my Windows to finish, after which I shall have to reinstall everything.
What a joke! I was so impressed with all of the features and would have tried them all and then bought the program. Instead, I shall now be warning people to stay away.