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Why will videos not play on sites? Youtubes do play

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Videos on sites do not play. sometimes the advertisement plays ,but then the video won't . This is windows 7, firefox4. It usually comes up saying the video is not available. I have checked for updates. Everything is updated. I have windows media player and flash. Youtubes are playing. I have re-installed and cleared history and cache. I have quicktime and realplayer also.