For vids to play in PPT, two things have to happen:
- PPT has to be able to FIND the linked video file, and
- The CODEC required by the video must be installed in Windows
To keep links from breaking, you have to:
- Save the PPT at least once before adding any videos
- Put the video files in the same folder as the saved PPT
- Make sure that the videos and the PPT file stay together, in same folder, on any computer where you want to play the presentation.
Package for CD should have handled all of that correctly for you, or modified the presentation so that it works as though it did.
As for CODEC though, you might try inserting the video into a new presentation on the system where the vids aren't working. If they still don't play, you need to figure out what codec was used and install it (or re-make the videos with a more common codec).
I'm not enough of a vid wiz to explain exactly how to do that; perhaps someone more knowledgeable will come along to fill in the blanks. If not, google is our friend.