Sony burner. Sound on player but not on laptop

I have a new Sony dual layer burner. Burns fine and get a good playback on my stand alone DVD player but itg will not play the sound on my Dell Inspiron 8100. Picture yes, sound no. I tested the sound with something from the music swamples on the laptop and it worked fine but not on any DVDs I burned.

Thoughts?

you need a surround decoder or a dvd playback software that have its own like windvd
so get one of these
a) ac3 filter - http://inmatrix.osnn.net/ac3filter_1_01a_rc5.exe
b) windvd 14day trial - http://a1394.g.akamai.net/7/1394/3235/v001/webdownload2.intervideo.com/windvd7/release2/Enu/WinDVD7.exe