Please take a look at my article here about asking for help with Orbiter issues - particularly, in this case, part 7. To help you effectively, we'll need some more information about your system, including what version of Windows, what drivers you're currently using (as malisle mentions above, the manufacturer's drivers are generally much better than Microsoft's default ones), and so on. You haven't really given us much to go on.
I'm also curious, does your card work for other games, or are you only trying it in Orbiter?
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