what sort of sound card do you have?
Most DVD drives work exactly the same as a CD rom drive, with respect to basic audio sound.
fit a standard audio cable from the DVD into your sound card and check that the software is working ok through windows control panel, I assume that you have two speakers, If you have digital speakers (5:1) and a digital sourround sound card, then you may need a SPDF (sony,phillips, digital,interface) cable fitted from your DVD to your sound card.<br />I have used all the above and still managed to get basic audio sound from my DVD using a basic cable.