Well i just upgraded or downgraded from Windows vista to Xp professional. But everytime i play World of warcraft i Blue screen at random times with a memory dump. But it happens very frequently in Major cities in the game. I have 9800 gtx + Asus motherboard Realtek sound card 4 gigs of ram 1k powersuply And all my drivers are up to date. I have no idea what it could be.