Here's my problem. I have Dell Inspiron 9300 with a SigmaTel sound card that obviously does not support 5.1 system. Also, I have a dock that's connected through a USB. Now when I connect all 5 speakers only the right and left work and the Subwoofer. How do I trick the computer into taking the signal for 2 speakers and yelling it out of all fice speakers? It works if I put in a DVD and use windows media player.