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i'm currently using a laptop with Windows 7, using Windows Media Player to open the movies. i didn't have trouble with any of the other ones i tried watching.
I've also checked this over on a windows 7 install and was able to view the tutorial movies both in Quicktime and Windows Media player. Typically these sorts of errors are the result of a missing Codec. As an easy fix, I would recommend installing quicktime, which should be able to play our tutorial videos.