Well, I might roll back to the original Vista just to see if an error in NWN happens with the vanilla edition. So far I have been able to fix it by rolling back my display drivers, so I do not know if the game simply does not like the newer forceware or if SP1 has bugged the game (I installed it after I had already updated to SP1).
Edit: If anyone else uses Vista and plays NWN, could you write about any error you might have had. The same request is true of sp1 users.
Edit #2:
Here is the exact error:
The game starts freezing - music will play, but everything else hangs for about 20 seconds before crashing. When I exit the game a little warning triangle pops up in my taskbar - "Video Driver Error - nvlddmkm has stopped responding and has recovered."