We are sorry to hear you had issues with playback.
Playback problems can be due to a lot of several factors. But for your specific issue, the reason for this is either the file has been downloaded too many times that it got corrupted in the process or that Windows media player does not recognize the codec.
To play it please download Quicktime player, for free from http://www.apple.com/quicktime/
In case the original file was corrupted somehow you can contact us directly at here and we will give you the link where you can download the file.
Thank You.