Also check soundblaster settings.set card to pass through multi channel sound , not to decode it.if the sound card is set to decode ,multi channel...
If you connect with digital (s/pdif) you will only get multi channel output from DVD's and then only if you set the sound card to pass through...
if your receiver has 5.1 or 7.1 inputs u can run three seperate stereo cables from your pc if it has 5.1 channel output. no ac3 or dts with one...
if your dvd player(or xbox) has digital out(optical or coaxial) and your soundcard has digital input you can use pc for surround decoding and...
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