He's right. Update your driver and patch the game. Don't use the autopatcher in the launcher. Go to lucasarts and find the patch and download it manually. You know what, to save you all the hassle, here is a link to the TSL 1.0b patch:
http://lucasarts.com/support/update/kotor2.html
(download link is at the bottom of the page)
If you have an international version, and not the American version, then you must download the 1.0a patch THEN the 1.0b, in that order.