OpenGL problem upon graphics card upgrade

I recently upgraded my graphics card from a 6800 XT to a 4830. Everything works fine in Ubuntu, but Vista has been having some trouble (not surprisingly). I have cleaned out the drivers and everything, and I have also tried reinstalling several times, but the problem still persists: In OpenGL apps, some polygons are not rendered. Is there a way to reinstall OpenGL or something to try to fix this? What should I do?

Thanks in advance,
Cory Walker