updated 1/28/11

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Problem:
No audio from Windows Media Player 11 when playing DVD or .mpg file.  Video plays fine.

Solution:
Download and install AC3Filter here: http://ac3filter.net/projects/ac3filter

The Story:
I got a new laptop at work.  Windows XP Professional with Windows Media Player 11 (WMP 11) installed.  When I would play DVDs, and most .mpg files (but not all .mpgs), the video would play, but there was no sound.  I downloaded the AC3 filter linked above (got the "Full" file), clicked the .exe to install it, chose "Full Installation," and then I had audio on DVDs and .mpg files again.