there are potentially 2 things that might help
1) disable onboard audio in bios
2) use a correct driver
Your card is
not supported by a unified driver or the latest beta driver. How did you end up with the unified driver? When you go to downloads and select
(the X-FI Xtreme Audio PCI-e)
only an audio pack is showing and no unified driver....
Anyway:
This is the driver you need:
taken from
this page.
Hope this helps.