Windows Live Movie Maker doesn't read .avi file?

I recorded my game using FRAPS and it gives me uncompressed video. If I recorded it on Windows 7, WLMM could read .avi file. but the problem is my videos were recorded on Windows XP. It can be played perfectly. When I change to Windows 7, no program could play it. It only play audio, no video. I hope you guys... show more I recorded my game using FRAPS and it gives me uncompressed video. If I recorded it on Windows 7, WLMM could read .avi file. but the problem is my videos were recorded on Windows XP. It can be played perfectly. When I change to Windows 7, no program could play it. It only play audio, no video.

I hope you guys can help me to play those vids well on Windows 7.

P.s. I don't know how to use Sony Vegas Pro or something else because they're so complicated. I think WLMM is the easiest video editor software.
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