http://zachd.com/pss/pss.html#mpeg2
has tips on this. You will probably want the XP Video Decoder Checkup
Utility - it sounds like you have multiple DVD decoders installed, which can
cause playback problems.

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(speaking for myself and doing this in my free time)
See http://zachd.com/pss/pss.html for some helpful WMP info.
This posting is provided "AS IS" with no warranties, and confers no rights.
Now Playing: "Technologic [Basement Jaxx Kontrol Mixx]" by "Daft Punk" in
WMP10.
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"Rudy" <Rudy@discussions.microsoft.com> wrote in message
news:77FDF483-12F6-471B-A30D-66850A954ACF@microsoft.com...
> Using Windows Media Player 10, the video portion of a commercial movie DVD
> plays fine but there is no sound. The movie plays properly on a regular
> DVD
> player. Any suggestions on where to start checking. This is the first
> attempt to play a DVD on the pc using WM Player 10.
> --
> Rudy