Are free registry cleaners any good?

I’m old school and was taught that there’s no such thing as a free lunch. Last fall I’ve downloaded Error Smart then Reg Cure, I thought they were free. I’ve since uninstalled them. They did find a lot of errors in my comp though. Then there’s System Mechanics Professional and I heard some good things about it. Please which are the best registry cleaners that I can purchase at a comp store or online, if such a thing exists.

Registry cleaners, free or not free can do more harm then good.

Now if you want something better then windows disk cleanup, either ccleaner or ATF cleaner are safe and free to use.