Ok, firstly, are you running the game on both of your cores? If so, do this: Start the game, alt-tab out, start the task manager, right-click the game's exe, select "set affinity," select one of the two cores, re-open the game. Secondly, have you tried older drivers? I have found that the newer 8XXX series drivers are buggy when used with NWN I, Kotor I, or Kotor II. Lastly, did you check the 16-bit compatibility mode box? If so, un-check it.