It is easy.
If your PowerPoint is only contains texts and images, you can save your
PowerPoint into JEPG format, then import the pictures into Windows Movie
Maker, after your create a Movie, burn it to DVD with DVD burner.
While if you want to retain the animations, sounds and video clips in your
PowerPoint, you need some PowerPoint to DVD converter like Wondershare
PPT2DVD,
More information:
http://www.ppt-to-dvd.com/ppt2dvd/overview.html#104
this tool can contain the dynamic element in your PowerPoint and create DVD
menu for you.