hi everyone.... i have been haveng a problem with one game on vista x64... im a gamer and i play many games all my games work perfect eccept fifa08 for some reason everytime a play this game runs smooth for like 10sec then starts running like if a program was running on the bg @ full speed

so what i did i reinstall vista (clean install) and before installing anything i install the game and nothing still runs like choppy like if i didn't have enough memory or something... i even try disabling some seervices defender,firewall, and other nothing help @ all... can some one help me thanks....