That's precisely my point.
An illegitimate (cracked) version of Battlefield 1942 would have modified files which may cause artifacts, horrendous lag, poor gameplay, etc. You can't use bogus serial numbers without patching the executable for this game.
Atremis' issue just initially struck me as a software modification error. But keep in mind that I didn't accuse [him] of it. I simply wrote the first thing that I was thinking when I read the post.
As far as assuming that Battlefield 1942 with Desert Combat being guaranteed to run because Unreal Tournament 2004 can, this isn't really a good comparison. Both of these games run on a different graphic engine.
Assuming your copy of Battlefield 1942 is legit... Have you tried reinstalling it? Have you updated your AC'97 audio drivers
? Is this during online multiplayer gameplay or singleplayer campaign missions? Ahh, how often do you defrag? Does your laptop omit any radiation above Orange 2?