Well the first obvious thing to do is make sure your drivers are updated. If you drivers are updated and it still doesn't work try some third party drivers. I ran Freelancer fine on my 5200. Microsoft never patched the game so I can't suggest that.
A good place to ask for help is in the EFS forums.
http://efs.proboards22.com/
Some of the best people I know online, all they do is play freelancer I am sure they can help you.
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