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
HyperCam and PowerPoint
If you have access to PowerPoint on the Mac, you can output your entire presentation to a QuickTime movie:
Slide Show to Go
How do I convert my PowerPoint presentations to VHS?
PowerPoint to DVD
PowerPoint to Video
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