Makes sense to use your receiver’s DAC instead of an aftermarket pc soundcard. See if your computer has a coaxial digital output, possibly labeled 'S/PDIF out' , if you have it, that’s all you need... Now, if your computer doesn’t have it, I use this to connect my htpc to my receiver via toslink S/PDIF. It cost less than 30US.

The sailor does not pray for wind, he learns to sail. --Lindborg