Weird black lines in the sky in KOTOR1

[PhoenixInANova]

I'm running KOTOR 1 on my Windows 7 64-bit laptop and everything else is running fine but when i see these black lines in the sky my game starts lagging a lot. This got really bad in dantooine and it crashed.

[Q]

Did you install the game according to the large-print instructions at the top of the second post in this thread (http://www.lucasforums.com/showthread.php?t=194324)?

[CptPriceless]

Turn grass and shadow off. See if that helps with the black lines - grass is sometimes glitchy and adds lines everywhere.