Problem Moviemaker…!
August 4th, 2013
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This could be a problem caused by codecs or many other things. You should delete all the ones you have and install a single pack of them. I recommend K-Lite Codec Pack:
http://www.free-codecs.com/download/k_lite_codec_pack.htm
You can find more fixes below, take a look:
http://www.windowsmoviemakers.net/Forums/ShowPost.aspx?PostID=5563
You should also make sure you have the most recent version of Windows Movie Maker installed.