Typically this is a vid driver issue, in your case, I would suspect that you need an OLDER driver, not the latest.
Anyway, the toolset uses Open GL 2.1.2 style drivers, and your vid card needs to support that version. The toolset may also require some other types of driver support.
Regardless, the best location to find these sorts of support answers is in the following forum
NWN Technical Support / Self Help