i upgraded from xp t vista home. with xp i had no problems with any games. now i have artifacts in every game i play. the screen flickers with colors. my specs xfxhd4890 e8500 3.16ghz 780isli mobo made by evga 500gb hard drive 7200rpm. i really dont know what to do. i want to be able to play games without artifacts! please help if you can :)