Ok I went through my setting and changed graphics to lower quality and used a GL accelerator. Now it workd fine, Thanks for your help.

Ok, I checked, I have an ATI Mobility Radeon 9000.

I have no idea what my video card is, but is good enough to run Rainbow Six: Athena Sword and America's Army; so I'm not worried about that. I think I installed 1.5 beta an 1.4. Should I reinstall the entire game and only 1.4?

Ok, I;m new here and this may be a stupid question. BUt, is it possible to play Descent III on an XP computer? I've had the game for years, last played years ago on win98 and now I've reinstalled it onto my laptop; but theres serious graphics problems. (ei: random squares appear under aiming reticle...