Hello, I'm a huge fan of the freeware for Reg/Disk cleaner and use it often.
My primary machine is a Windows 7 (64bit, UAC disabled, always elevated privileges).
My secondary machine is a Windows XP (32bit, always elevated privileges).
But this is regarding an issue I had after using RegCleaner on a friend's laptop and how I solved it.
This information may be useful to the developers. It's not fully intended for other users to use as a solid solution to any given problem.
I believe my problem may have been purely circumstantial and rare.
DISCLAIMER: I don't claim that it will work 100%