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my pc has more than 1000 errors.
so far all the free cleaners only clean up to 10 errors each.
any idea if there is a free cleaner that can clean all at one go?
ccleaner, look under registry.
It is better not to use a registry cleaner as it can cause more problems...those 1000 "errors" are actually small issue, usually it is leftover files when you delete a program.
those file size will only be a few kb, and not removing them will not affect perfomance in any way.