Ouch ermm didnt think to ask if the system was USB i gathered it would be audio jacks and thats why you asked as you said
you had the "default thingy" on your motherboard...
Take your soundcard back to the store and claim either its faulty or not compatable as USB sound systems dont use any
on board sound cards they have there own amp and card built in and whatever you do wont make a difference
Sorry man

Hope you get your cash back
****Edit****
If they say you cant return it, kick up a fuss as you have usually 28 days to change your mind unless they clearly state on the purchase you have such and such a time and you only got it yesterday
so they have to return it for you
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