Utilities for keeping a pc clean.
Malwarebytes Anti Malware, Spybot Search & Destroy V2, and Microsoft Security Essentials. Temporary File Cleaner or TFC isn't bad for clearing up junk temp files.
As a rule I never use registry cleaning programs, they always throw away stuff you need without fail. Please feel free to use everything listed here though. When you break your computer call a tech to fix it. Keep us employed
I concur with dalethepcman. As a fellow tech, I like to apply the k.i.s.s. method when fixing a pc, to help retrace my steps should something go awry. Registry cleaners are such a no no...such risk when using one, and the gains are pretty un-measurable anyways.