vertex shaders

[jens]

The game runs on 8800 cards so this sounds like a typical problem due to the moon and the sun being in the just right position and so on

Only advice I can give is to make sure you really do uninstall the old drivers completely, restart the computer and then install the new ones. Even if the drivers you have are new something minor could be corrupted or what not and a reinstall of the drivers could fix it.