Check your temperatures with HWMonitor (available from www.cpuid.com ) to check for potential overheating issues. Typically, your processor shouldn't exceed 70 (It should idle at 35 or lower) and your GPU shouldn't exceed 90 (idles at about 40).
Run memtest 86+ or Prime95 to check for potential CPU/memory issues. It will show any errors it can find.
Run FurMark to check for GPU stability. (This will generate a lot of heat and use a lot of power. If your GPU temperature goes higher than 90, I suggest you stop the program immediately to prevent damaging your GPU.). If you see any graphical glitches, it could mean there is a problem with your video card.
I suggest you run all of these, in the order I posted them, to do a general check-up of your components. You should also keep your drivers updated. The latest drivers can be downloaded at www.nvidia.com
I tried the demo and the graphics were pretty "stone age". Also you can only drop bombs by hitting "L Shift + D", how stupid is that? It's kinda hard flying with a joystick while you have one hand on "L Shift + D". Maybe one of the fire buttons on the joystick would be better??? Just dumb.