There are different tools you can use to convert presentations to DVD format.
Check this software out that does that for you:
http://bytescout.com/how_to_convert_powerpoint_to_video.html
On the other hand, if you want to prevent installing any software and want
to do it the easy way out you can do this:
Print Screen for every slide and paste it to Paint and save it as a JPEG
picture format. Once you have captured every slide as an image file make sure
that your DVD player supports JPEGs and put it as an slideshow(Burn all the
images to your DVD or CD).
Please let me know if you have any other questions,
Vicente Tulliano