If anyone has Jane's USAF some fans made a patch that makes it compatible with XP/Vista. The only problem is that it's not very friendly to the newer generations of video cards. The framerate slows to a crawl till you get about 2 frames a second.
You do however have to purchase a pass to download the patches. It's 5$ for a 7-day pass. Not a bad price to get that old Windows 98 game out of mothballs. The patch does require you to have the original game to play.
Here's the site:
http://www.gulfknight.net/index.html
The patch comes in 2 flavors, USAF Pure and Super Pro. You can read about them on the site.
Here's instructions:
http://janes-usaf.tripod.com/id1.html