Snagit will work just great for this, and will capture audio as well. Since it's free to try for 30 days, give it a go and see how you like it. You may need to try different capture codecs and settings to get the best results. If you don't like the results, you're not out anything.

I do know that there are other tools around that will convert PP files directly to video, but fully functional free trials are another matter. Rather than telling you what won't work, I'm just trying to help you find something that will work. A google for "powerpoint conversion" returns a lot of tools. Once converted to any video format, making a DVD-video is pretty simple.