Which version of windows are you running? Have you checked your computer for ram or other issues ? I've not had anything problems with either kb games under widows xp (sp2 and now sp3) and either atii (1800) or nvidia (8800gts) graphic cards (but when I switched from ati to nvidia) i had a brief problem due to caching of certain raster images; took a while to figure out what had to be deleted. Also when I upgraded my monitor (old one died) the game would crash on start up and I had to manually edit the config file to add in the new resolution (the old one had a resolution that was not valid for the new one).
I will admit that kb-tl (the first game) is a bit buggy prior to patches but the steam version is already patched (I purchased the atari version first day it was available (i think 1.5) and had to patch it to 1.6 (russian patch) to get it to run correctly (atari refused to release a patch; not sure if they have - i don't think they ever did and you have to go through 1c or katurai; but 1.6 works well for me so I never updating to 1.7).
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