Did you try uninstalling and reinstalling the game according to the SECOND POST of this thread?:
If that doesnt work, then i have two question/suggestions.
1.) Is your labtop overheating while running the game? (If you are running it on a labtop at all)
2.) If its not, then i suggest downloading and installing The Restored Content Mod: Version 1.8 which is found here:
or if that doesnt work you can download it here:
Obviously, it is a mod that restores all of the cut content from the game. More importantly, it introduces A LOT of bug fixes such as see through, the brown neck area problem on jedi robes, and see through droids and many, MANY other bug fixes. If that doesnt work, then try updating your driver. If THAT doesnt work, then theres not much more you can do besides wait for someone else to suggest something or contacting "Yoda's Help Desk".
Also add a new line in your .ini in the graphics options and enter "Disable Vertex Buffer Objects=1" without the quotes. Save. Exit. Its not related to your problem, but it should help on dantooine with the lag.
Remember to answer my question and to reinstall according to the SECOND POST of the thread on the link above!