Some years ago during the win98/me age there was a recreation of the original XWing and Tie FIghter from DOS into a Win app that used real 3D textured graphics and had some extra stages, plus all text was chatty now. Well once 2K/XP came up apparantly it pitched a bitch usually in XW and 100% Tie would fail.
If you are mising these games and have THIS version (2 Disc package) then if you go over to http://www.lucasfiles.com they have a fix. Just install the game(s) and run the patcher. Been playing Tie for a few hours now with zero issues... damn I missed that game... Still THE best Star Wars combat flight sim made with XW taking a cozy 2nd.