Running XP or Vista? If you allowed the auto updater during installation to check for updates you saw Vista drivers go onto XP there! I went through that crud when putting the new build here together and XP saw problems first with the XtremeAudio and then XtremeGamer card due to that alone.
Remove the current software/drivers and check the support site for the Dec. 2006 XP update. The July 2007 on the XP page is for Vista!
Apparently Creative finally got around to correcting that mess.
http://us.creative.com/support/downl...ype=0&x=21&y=8