How to use MOVIE MAKER (to edit videos)?

SPANISH
http://www.youtube.com/watch?v=4H3Hm1Wf7pA
http://www.youtube.com/watch?v=agQEkhB14Bc&feature=related
http://mosaic.uoc.edu/2009/11/20/manual-basico-de-windows-movie-maker/
ENGLISH
http://www.youtube.com/watch?v=_9rRh7z5TCs