well i had that problem with The phantom menace. and the problem there was that the game couldnt see my graphics card correctly. so i tried and initialize it... but i think i reinstalled it 4 times. or restarted my comp untill it worked.
can you change the settings on RS of graphics cards and that sort of stuff.... maybe that will help.
it is only an idea tho. hope it helps.
"You know, if I had even the tiniest control over the Force,
What I,d do with it? I,d scratch that little spot in the center
of my back I can never reach."
X-wing book nr. 5. Wraith Squadron