If you’d gotten quite used to ‘Windows Movie Maker’ in Windows Vista, you’ll probably notice right away after you start using Windows 7, that the new so-called ‘Windows Live Movie Maker’ is pretty crap!!! to put it mildly…
here’s an excellent solution:
How to Install Windows Movie Maker 6.0 on Windows 7
Although as far as I could make out, this depends on you having access somehow, to the old ‘Windows Movie Maker’ files from a Vista machine.