Hi bodell3,
It's possible that when you ran unhackme that if it found any infections that it took out parts of your OS with it. I have seen this happen before. You can try to use your XP cd and do a repair and see if that fixes the problem, before doing that though I suggest you take the hard drive out of your machine and put it into another computer as slave and backup any data you want to save. If the repair doesn't work your best bet would be to format and do a fresh reinstall of XP.