That will depend surprizingly on the version of Windows you are running. For one of the new Creative X-FI models the autoupdater will see Vista drivers downloaded onto an XP machine! The dec. 06 update is for XP with the web updater1 seen. But the july 2007 is actually the web updater3 for Vista!
What happened to updater2 for XP? is a mystery. That was seen on the lower end or rather simply lower priced Xtreme Audio model while the difference between that and the Xtreme Gamer is simply the software. Both cards are identical except with the Gamer you see 3 not one face plate in XP(theatre) with another in Vista(Entertainment).
The Gamer can use all 3 in both XP or Vista. That's the story with Creative seen on a new build here. An alternative brand seeing good reviews would be the Diamod brand of sound cards. But the old Audigy 4 Pro was good for both multimedia and gaming.