1) Most drivers will give you that error, but make sure you are using the certified drivers for the GF card. (That means they are from either microsoft.com, nvidia.com or the cardmakers site. Go for nvidia.com) The most reliable drivers for MOH right now are 30.82. You can find them at
http://www.voodoofiles.com/type.asp?cat_id=4 (5th down)
2) That error means your drivers aren't good for MOH, and you need to update them, follow above. Also, make sure you run config.exe in the MOH directory once the drivers are installed.