Hello there!
It seems that my Radeon 9600XT card could have some problems with it's voltage regulator.
I experienced the "colorful vertical lines" aka "multi-colored vertical lines" problem with complete crash in numerous titles like KOTOR1&2, Jedi Knight II&III, C&C Generals and so on... Tried everything and always thought it was a driver problem.
Now I am using ATI TRAY TOOL with the most recent Omega Drivers to clock down my card by 20 perecnt (now 400/240 mhz). This solved ALL of my problems. The titles quoted above work like hell. I player KOTOR1 for hours yesterday without a single crash. I can reproduce the problem: as soon as i run memory und gpu with the normal frequencies, the crashes re-occur.
Even with the 20 percent clock down the game runs fast enough on my P4 3.0Ghz.
Maybe this helps someone. I am happy now - both KOTOR titles are working again!!! (w00t)
Bye locutus