Thanks for the links. It's all over now. I've never seen a system as hosed up as this one was.
I managed to get an anti-virus program to run and clean quite a few viruses but it was going to take more time than he was willing to pay for so I saved the pictures he wanted and did a clean install yesterday.
I think I've figured out what started the problem in the first place. A teenager (who thinks he's a computer expert) turned off all of the protection services "So the Internet would be faster".
From what I saw in the browser history I guess the porn wasn't loading fast enough for him.
