Look in the 2nd post of this thread
and check out the Dantooine lag fix, setting CPU affinity and the Intel reference at the end.
If you're using Vista, you're going to have to reinstall the game according to the instructions in both the 1st and 2nd posts. No guarantees that it will work, though. I can say that I've been successful in getting KotOR 2 to run on an Intel GPU laptop with Vista, but I know that many others have not.