Here's how to use Windows Movie Maker, Paint, and Sound Recorder -- Windows XP Version but should translate to Vista easily.

So how am I using it.

I'm teaching 3 sections of Math/Science Study Skills - all these kids have a regular math class. 

The assignment is to create a movie using the free tools describing independent and dependent variables.

Today I showed them the free tools.  Went my speed and recorded it as above.   It was funny because one little gal raised her hand and said she didn't understand a word I said and I said, "Fine, I made a movie".

Feel free to play with.

It will be interesting to see what comes of it.