Does anybody know of a free "Registry Cleaner Software" that not only scan
your PC, but also repairs all errors?
You are looking for trouble!
I strongly suggest you avoid using any registry cleaning program.
Cleaning of the registry isn't needed and is dangerous. Leave the
registry alone and don't use any registry cleaner. Despite what many
people think, and what vendors of registry cleaning software try to
convince you of, having unused registry entries doesn't really hurt
you.
The risk of a serious problem caused by a registry cleaner erroneously
removing an entry you need is far greater than any potential benefit
it may have.