Strange pixelating of images in games.

The menus and HUDs in several mods for Battlefield 1942 are badly pixelated. I've never encountered the problem in any other games, just the one.

For years I attributed this to the developers of the mods, but my brother sais his computer doesn't have this dysfunction. I don't have the slightest clue why it's happening, so even a guess could be helpful.

Video card = ATI Radeon 9550 256MB.

For now I'll mess around with my video settings and see if I can get it working properly.


Edit:
No combination of video settings seems to do it. I've thrown together an image to illustrate the problem, but I'm not sure how to go about uploading it since it needs a URL.