Some Mpeg 4 video files not working under Window 7

I recently purchased a new PC running under Windows 7 OS. Obviously I have installed the latest version of ITunes and QuickTime player. I transferred all my music and video files from my vista laptop to the PC. The music files play fine using ITunes and the most recent music video files play ok too, but there seems to be a problem with the older music video files. When I try to play one of the older music video files, ITunes asks for authorization for the new PC to play the video each time I try to play the same video. ITunes grants authorization each time, but the video does not play, it shows that the video is playing on the progression bar but the music video is not displayed.
I have tried to play the music video using windows media player, but windows media error message says that it doesn't support the format of the music video.
I am perplexed as to what is going on; why will the newer music videos play through ITunes and not the older ones, and why doesn't windows media player support Mpeg 4 video files?

This article says you need to convert the AOL account to an apple id.
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