There are a number of ways you could do this, depending on what hardware and software you have. Is Windows Movie Maker the only software you have access to? You could use a shop window dummy and dress it up or just video the sky, do a completely black outline of a person in Photoshop and try and animate it so it looks like it is falling, it's a pity you don't have access to blue screen where you could have someone lying on two stools with the bluescreen behind them, in editing you would replace the blue with a sky background and get a large electric fan to blow their hair and clothes and make it look like they are falling.

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