Sims 2 DirectX 9.0c problem

okay i bought a new computer thurdsay and it is going great i can run the highest graphics on WOrld of warcraft and still get 60FPS (using windows 7 ultimate via bootcamp) i just have a problem with the sims 2 it is saying failed to find any directx 9.0c compatible graphics adapters in the systerm! ets. and i a really annoyed at this because i can run games later than that like modern warfare 2 super smoothly anyways here are my specs:
Macbook 13.3"
2gb RAM
NVIDIA GeForce 320M graphics processor with 256MB of DDR3 SDRAM

its saying i dont have a directx compatible card. i have installed directx 9.0c like it said and it worked only once and after that its just been giving the same errors like last time and i am also running with admin rights and compadibility as WIN XP SP2
so it wont come up with "unspecified error" every time
thanks so much in advance
 
Back