How to create a narrated PowerPoint file uploadable to YouTube.

To make a narrated PowerPoint file video to YouTube:

1) You need to save the PowerPoint file to JPEG files.
2)  Import these JPEG files to Windows live movie maker. To start Windows live movie maker in
Windows 7, go to start menu, click Windows  Live, select Windows live movie maker.
3) Click each JPEG file and drag it to story board, click "start narration" and speak using your microphone, and click "stop narration" when it is done.
4) In final sharing, you can upload it to YouTube
.
Video: PowerPoint to YouTube using Windows Movie Maker