Does it play when you click on the video frame? If not, it could be that your
settings have been modified by Real Player. See
http://www.soniacoleman.com/Tutorials/PowerPoint/multimedia.htm. Read section 3
and check your MCI settings that it describes.
If the video does play when clicked, then you can do a couple of things. When
you insert the video, you are asked whether you want it to play automatically.
Respond "Yes". For a video that is already inserted, go to Custom Animation and
set the video to play "after previous". If you had told us which version of
PowerPoint you are using I could have told you the exact steps for modifying the
Custom Animation settings.
--
Sonia Coleman
Microsoft PowerPoint MVP Team
Autorun Software, Templates and Tutorials
http://www.soniacoleman.com