you can create a SLIDE Show and output it via a Composite output if your video card has a TV (old fashioned analog kind) video Out.
I don't think there's any other way except a long manual process -- create the slides as a set of individual JPG's (JPEGS), save to a SD / other type card and then use some camera software for displaying them. Some video / DVD players have a card reader which will play jpegs from a card.
You might be able to find some free DVD authoring software for creating a DVD of the jpegs but if you have a digital camera the software included is usually OK.
With a digital camera you should be OK on any case as the camera will usually output to a composite device so just stick the card into your camera, connect up to your device and play.
(Ensure when you create the jpegs from your power point presentation that the image size is within the size allowed by your camera --should be).
Once you've got them (the photoshop slides) as JPEGS Photoshop can create a slide show as well.