You won't be able to use any kind of DOS drivers under windows 2000 or XP (especially for the audigy). Maybe you could install windows 95? I don't know that the audigy would have DOS compatible drivers still though... try poking around creative's site. If you can't...your best bet is to try and find an older card, like a sound blaster 16 or something. I would figure Grim Fandango would work with the audigy though, that sucks. Well, sorry I can't be any more help, I don't have any of these products...good luck
edit: Sorry but after looking around Creative's website it doesn't look like they have any DOS support for the Audigy...it only works with 98+, too. Hey is Full Throttle supposed to run under Windows 95/98 according to the box? Or does it run under DOS...?
sorry if i'm incoherent it's 3AM hehe