Creative Labs is just a mess.  I bought a Audigy 2 Platinum EX for around $400, but if I upgrade to Vista, DVD-Audio, Dolby DTS Decoding, EAX, Midi, 6.1 Sound and SPDIF are all disabled.  However, if I pay $9.99, I can get EAX to work.  And for the rest, I have to buy their latest sound card, because that's what they want you to do.

So I put that card back in an XP box, and am using an onboard realtek card that supports all those features except for DVD-Audio for no extra charge.

Only advice I can give is not to buy anything from them; when their next card comes out, and a new version of Windows comes out, they'll decide again to drop support and instead force you to buy yet another sound card to get the features you've already paid for.