New version! - There are many registry cleaners in the market which claim
x64 compatible, however, almost all of them are NOT compatible with x64 at all. They just run on x64, but not aware of x64. Such registry cleaner even doesn't know it is running on the x64 version of Windows and it just treats it as 32 bit Windows, so it can only find a small part of the registry problems (only from the 32 bit part of the registry view). Further more, as they cannot even view the whole registry, using such registry cleaners on x64 systems often corrupt your registry and cause more problems than they can fix.