Help, Im stuck in Fast Forward

Hey , Definite newb to the TG forum, I need some help since rockstar is really slow to do anything. Heres the situation. I was running a 3500+ and 2 6600GT's. And Grand Theft Auto San Andreas Ran great. After some scrimping, I bought a 4800+ X2 (Awesome as heck BTW) and reinstalled windows (XP Pro SP2), and the game ran a little weird, but ok. I then went and bought a 7900GT OC and the game runs in FAST FORWARD, its hilarious to watch, but to try and play it is a pain. To give you an idea of how fast. Its supposed the be 1 real minute = 1 game hour (24 minutes = 1 game day) With the 4800+ X2 and the 7900gt oc , 7 seconds real time = 1 game hour, 2.8 minutes = 1 game day. So can anyone help, the fastforward makes the game impossible to play, and it throws the physics off, all the cars in the game (AI ones) have huge pile up wrecks. THANKS