I remember long ago that we had some of those problems before. Seems like it had to do with video drivers at the time. Before you dive into serious tweaking, you might check to see if you are set to 32 bit and change it to 16 and see what happens. try a few simple changes like that first and see what the results are.............
After that it was a matter of changing video drivers to see what worked better IIRC.
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