Have you tried to use GSpot (as written in BSPeter's "READ THIS FIRST BEFORE POSTING" post also linked as FAQ in my signature)?
Open your file with GSpot, see if you have installed a working codec and/or tell us which codec is needed to play your movie (still read the info in GSpot) and if it's installed on your system (as already said, this info is made available in GSpot too)
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