sim hangs after warp

After wrestling with a radeon 'all-in-wonder' card (which wouldn't render terrain) I slapped in my older GeForce Pro2 and after shoe-horning the latest nVidia drivers finally got the game to configure and load. It actually slips along quite nicely at a high frame rate and detail. The problem is with game hanging as you either come out of warp (the only way around this is pressing ctrl=X to exit warp before it automatically exits) or when the final mission goal comes up telling you end the mission- the game just hangs- no keyboard or mouse. I have to press reset. The board is a VIA Apollo KT266A AMD athlon....etc 
