I have recently bought Lock On, and after I installed the sim, I read the read me file, and went into the options and changed some of the settings. I then went to fly one of the training missions and found that when you enter the flight part of the game, everything is black. The only thing I can see is the HUD or the MPCD, or anything that is a digital instrument in the cockpit. It happens whether its trainging or regular missions. Could this just be my graphics card? I have a Pentium 4 1.69 Ghz, 1 GB RAM, and an NVIDIA TNT2 Model 64 graphics card. Do I need a new card of what? Please help.

Yup, at the very least, you need a new graphics card. You actually need a whole new system because running LOMAC on that processor will be disappointing to say the least.