All else fails man, you did get a broken cd with your product, take 'er back, get a refund. I've been fighting with my own X-FI for the past two weeks since I put in my new motherboard, and I'm ready to tear it apart.
PCI-E add-in cards are iffy on the support side at the moment, mostly because most techs don't know how to make heads or tails of them. And rightly so too, they're so uncommon despite what everyone expected when PCI-E first came to the front.
If you can, exchange it for a regular PCI model and see if that clears it up. And make sure you; and this is a bit of a dopey tidbit but I have to say it, uninstall the old drivers and programs that were installed with the old sound card.
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Athlon 64 X2 5000+ Black Edition OC'd 3.2GHz
Asus M3A32-MVP Deluxe/WiFi
4GB Geil PC6400 2x2 Kit
Sapphire Radeon HD 2900 XT
Creative X-FI XtremeGamer
WD 250GB 2500KS SATA-II
WD 500GB 5000AAKS SATA-II
Samsung SH203-B SATA DVD-RW
Thermaltake ToughPower 750W
Antec P182
Windows Vista 64-Bit Home Premium