Neverwinter Nights. It's by Black Isle, the same people behind Fallout (I and II), Baldur's Gate (I and II), Icewind Dale, and Planescape: Torment. It's AD&D 3rd edition based. If any one has BGII, there's an awesome video for it. Also, try http://www.neverwinternights.com (I think that's it)