Solutions:
Dual sound card config; Integrated + standalone
Looks like this
Stream1 -> jack output -> LineIn1 soundcard1 -> Speakers Output soundcard1
Stream2 -> jack output -> LineIn1 soundcard2/LineIn2 soundcard1 - > Speakers Output soundcard2
This can be done in windows 7 using the "Listen to" function or directly to the sound card manager as long as you're using an external device with 2 outputs capable of outputing 2 streams separately to play the dvd and not the computer itself.