I think this may work...
Make a text file and call it "autorun.inf", then insert the following text into it:
[autorun]
open=Presentation.ppt
Put the "autorun.inf" file on the cd with the powerpoint presentation, and if the computer/CD-ROM support autorun, then it should start up the presentation inside of powerpoint.
If that does not work, you can autorun a VBS (visual basic script) file that calls powerpoint and loads the presentation.
jason