Look at a tool like Camtasia or HyperCam to record your presentation to a movie – thereafter create a VCD/DVD from that movie.
These links might help:
Camtasia Studio and PowerPoint
Camtasia Studio and PowerPoint – Another Tutorial
If you have access to PowerPoint on the Mac, you can output your entire presentation to a QuickTime movie:
Related Links:
How do I convert my PowerPoint presentations to VHS?