Why won't my videos work on windows movie maker?

I'm using a sony HD camcorder, and My videos will NOT work on windows media player or movie maker. I want to make better videos for youtube by using movie maker, but my camera can only upload straight to youtube. Is there any way I can convert the video file so it'll go in windows movie maker? If so, how do... show more I'm using a sony HD camcorder, and My videos will NOT work on windows media player or movie maker. I want to make better videos for youtube by using movie maker, but my camera can only upload straight to youtube. Is there any way I can convert the video file so it'll go in windows movie maker? If so, how do I do it?
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