Try using screen capture software. CamStudio is free.

If it's fairly short (and it sounds like it is, since you say it's only 7 slides), you could use Jing Project which is very simple to use. You're limited to 5 minutes, but that should be more than sufficient especially if this is meant to be a Youtube video.

Paul

Alternatively, you can also convert powerpoint to
video. There are numerous tools that help you do it:

powerpoint to video - Google Search

Tyrus

If you want a free option download jing (techsmith.com)

1. Open up each page of your powerpoint slide in full screen
2. 'take a picture' of your screen with jing (its really easy to use!)
3. Save the pic
4. Import it to Windows movie maker (comes standard with most computers)
5. Play around with your timing etc and you can even add voice overs or music
6. When your done push publish and then upload to youtube

The great thing is its once you have done it once you will see it is so easy! plus doesn't have any time limits etc... youtube is your only limit.

Hope that helps but let me know if you need anymore info!

Helen