Most of backgrounds from the websites I referenced in my post can be downloaded as AVI files (.avi) or quicktime files (.mov). You should be able to use the AVI files in Windows Movie Maker. However, putting students in front of the backgrounds requires the use of the chroma key effect (green screen), and that is not an available feature in Movie Maker.
The backgrounds can get a little expensive if you purchase an entire volume. Oftentimes websites require you purchase an entire volume and will not allow single downloads. However, at motionloops.com and anistock.com you can download single clips. It is much less expensive.
Since the backgrounds are not part of Windows Movie Maker, you must download the clips from the websites, save them to a folder on your computer, and then insert them into your Movie Maker project. Let me know if you have any other questions!
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