Trying to import videos from Kodak Easyshare C613 camera to WindowsMovieMaker but are invalid.help convert?

I am trying to import videos i took with my new Kodak Easyshare c613 camera to WindowsMovieMaker but they are showing up as invalid (they are .avi files) . ive tried downloading programs to convert these files to .wmv but nothing works. these videos are important for a show i post on youtube but they wont upload!... show more I am trying to import videos i took with my new Kodak Easyshare c613 camera to WindowsMovieMaker but they are showing up as invalid (they are .avi files) . ive tried downloading programs to convert these files to .wmv but nothing works. these videos are important for a show i post on youtube but they wont upload! please help me to convert these files!
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