Adware Alert removal problems

Hi all - My dad recently tried to uninstall Adware Alert on his XP computer and now it continuously reboots when he starts it up. I tapped F8 and got it to run with "last known good configuration" which puts it in safe mode, but the keyboard won't work. I checked the driver in the Event manager and it shows an error 39. The Adware Alert icon is still on his desktop but it won't run. He said he tried System Restore but it says it can't complete it. I ran Chkdsk, but nothing has changed. I don't know very much about what else to do since I've never had this problem (I don't click on ads). I think it has messed with the registry, but I'm not sure what to do.

Any help would be greatly appreciated. I did a search and read that this is a suspected rogue spyware program, but he vountarily installed it himself so spy sweeper doesn't catch it as being bad.

 

Thanks - I don't think he did anything to the registry himself, or if he did, he wouldn't know it since he doesn't know too much about computers. He doesn't have any XP cd's because it was preinstalled by Dell, as was mine, so I'll ask around and see if I can find one.