EOC only runs at 640 x 480

Installed EOC earlier after a long search for the best space sim, patched it, then installed Torn Stars and started to try and play it. Went into graphics, set them all to max (with 1024 x 786 resolution) and went into instant action to try it out…and it runs fine for five seconds before starting to glitch out on me, flashing green and skipping horrendously. After a while of experimenting and research on the issue, I found out that the only time EOC runs at all is when the game is set to 640 x 480. I figured at first it was a Windows 7 (which I am running) issue but I decided later it was most likely a graphics card issue. Haven’t tried rolling back my drivers yet, though I will try soon (just don’t want to as it’s not the only game I play).

Specs:
2.5 GHz dual core AMD (affinity set to only one core, no dice)
Nvidia GeForce 9600 GT (with the latest ‘prerelease’ Windows 7 drivers)