well,,i fixed a buddies computer about a month ago,,he was having issues like that,,does it just act funny on aces high?,,or more games?,,,his did it on alot of games,,,and on aces high his grafics would freeze only for a secont when he shot his guns,,and then clean up,,,well,,we rebooted hard drive and everything,,all video divers,,and directx,,and it still would do that during games,,,and finaly we replaced the hard drive,,,and now,,everything runs smooth,,,,so if sounds like what is happing to you,,,,try what i did,,it was the only thing that got his computer working good again,,lol what kinda 3d card do you have?