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Originally Posted by Nocturnus Anytime I ever suspected I had a issue like that, I would just reinstall.
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This is a difficult situation. They only sure way to remove it, is to reformat the hard drive and then reinstall all of the software from the original disks. This can be a long painstaking process, but it will solve the problem.
Another potential problem is that if your son's computer is on a home network and his computer is connected to other computers on the network, then it is possible that those computers are infected as well. I hate to raise an alarm if un-necessary, but our firm has a digital forensics lab and we have run into this in the past with our clients' computers. I would make sure that your son's computer did not have the other harddrives mapped to it from other computers and/or network storage devices.
After you remove the problem software, remember to the best defense are passwords that are alpa-numeric strings, that use lower and upper case, letters and numbers and are at least 20 characters long. The advantage here is that a brute force attack would require a network of computers and years of time to crack the password.
In the future if you are going to play online games like WOW, I would set-up a dedicated gaming computer that is completley isolated from any other computer and is not used for any other purpose. Think of it as a gaming cut-out. If it is hacked, all they will find are games and no personal information.