MP4 to WMV video editing? Help..?

When I take videos on my camera, then upload then to the computer, they are MP4 files (Bear with me, I have no idea what I'm talking about here.) Now I try to import them to Windows Movie maker but it doesn't support MP4 or something like that... Is there a program where I can edit MP4 videos? And why... show more When I take videos on my camera, then upload then to the computer, they are MP4 files (Bear with me, I have no idea what I'm talking about here.) Now I try to import them to Windows Movie maker but it doesn't support MP4 or something like that... Is there a program where I can edit MP4 videos? And why doesn't my camera do WMV...?

Oh and I already tried to convert the file on some site once but the video came out all choppy and weird, so I can't do that. :/
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