This is usually caused by odd video content that uses a "CODEC" that Microsoft won't get for you. Read http://www.moviecodec.com for information.
I will NOT know which codec you need.
Bob
Am using 9serios windows media player, when i am trying play media player its requesting for licence and other steps doing perfectly, after seek bar is moving, but i can't see any picture or audio!
am using XP.
sajith

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