I need help with a flash video issue!

I have inserted MP4 files as flash movies into my PPT presentation.  I publish to my hard drive and everything plays just fine.  But, when I copy the files (the data, player and player.html) to a shared location, the PPT files play, but the movies don't.  The slides that contain the movies show "paused" at the bottom, but they won't play.  What am I doing wrong?  I even copied all t MP4 files over to the shared location and then re-inserted them into the PPT from that location, but still no luck! 

Help!  I need to get this presentation out the door asap. 

Thank you.

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