well basically I get a comp that had a previous trojan virus for 50$ from someone.I get It home run a AVG virus sweep and remove all the virusus from the HDD. Then Everything seems to going ok. Since that Time I have done quite a few upgrades, more RAM,vid card, and PSU. Now I go and try and run Doom 3 the game works great! I play other games like this one and slowly the comp starts getting errors. I have tried everything I know how to do, I think the reg files a messed up or the virus has simply come back.What can I do in this situation? Is there a way I can keep all the data of my comp or do a clean install (because I don't have internet on that one).