I get the feeling this was already posted somewhere on the DK forum, but I searched for it and couldn't find anything. Maybe it will help some people, maybe it won't, but it's worth a post:

http://www.neoseeker.com/forums/2820/t1394451-dungeon-keeper-2-how-to-run-under-xp-vista-win7/

It looks like this post also helped some people:
http://www.neoseeker.com/forums/2820/t1394451-dungeon-keeper-2-how-to-run-under-xp-vista-win7/#13

This is still only for those with nVidia cards though right?

Honestly, I do not know. I would /assume/ it's for anyone who is unable to run the game.