I really appreciate your replies, Ishi and Marmite! I guess what I'll do is run the registry cleaner in the profile that has some admin privileges, then run it in the other profiles and see if it finds anything else. I'll post my findings afterward.
(Hmmm... I wonder if I enabled the Admin account and ran it from there, if it would have a better chance of doing it all...)
That's going to be at least a few days... I have to finish disinfecting this thing first. I'm working on a friend's computer... the one the teenage kids played on over at grandma's house, so... you can just imagine...
Thank you again! I'll let you know what happens.