Did you check out the tips in the readme text file? Other than turning off hardware sound acceleration or playing with the video options, I'm not sure what else to do. I don't know why the cut scenes in Aleroth worked, but others cause the game to crash.
Try starting a new game, then running to the troll cave and see if it crashes. Maybe save the new game first, and use
iZakaroN's SaveEditor to bump up your constitution.
Try emailing
support@larian.com with a link to this topic.
