I found the problem. Now, I'm not sure why it's a problem - but I visit another tech forum (PC Gamer UK), and apparently there's an option on video players called something along the name of "Overlay Video Output". Not a clue what it is or what it does, or even why it's causing a problem. But I turned it off in WMP and VLC, and video's work! I can play SWAT 2 again!
10/8/06 at 7:56am