I completely forgot about this thread last night - I read it, knew I had the MOH demo lying around, so I installed it and proceeded to play it for an hour and a half! Excellent game, and I was astonished at how well the AI trys to look for cover, out flank you, and wait for you to come out from behind cover before trying to shoot you.
The visuals are also excellent (played it in 1280x1024 with all settings maxed) and didn't notice any problems or framerate drops, other than the fact that I once dropped underneath the world (I guess I hit a hole in the demo's floor as I was inching my way along a wall). I'm using a Radeon 8500, btw. I would guess your problem may be in trying to use the Radeon drivers with your MSI GeForce3 Ti200

(just joking, I'm guessing you have another computer or recently changed the video card and forgot to change your sig).
You may want to check to see if you've properly installed the game, and if Dx8 is properly installed. What kind of error do you get, and which drivers are you using?