Always difficult tio diagnose that stuff from a distance but have you tried the following?
1/
You've disabled the on-board sound so far as I can see.
2/
Check whether there is a drivers update from the Diamond support site & download if there is.
3/
Re-install the chipset drivers from the drivers disk that came with the sound card & re-boot.
4/
Reinstall all the other driver(s) - I'm not conversant with your particular card
In my book that's the first rule. Re-install drivers in the right order.
Hope that helps.
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Posting Virtuoso
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since Aug 2007