I cant watch or download youtube videos?

hi cant watch youtube videos or also cant download when i click any video page loaded fully but video display portion remains black or some video stats buffering after buffer some second it stops and when i try to dowbload video using downloader helper it gives me marely 200 to 500bytes per sec speed also it stops... show more hi cant watch youtube videos or also cant download
when i click any video page loaded fully but video display portion remains black or some video stats buffering after buffer some second it stops and when i try to dowbload video using downloader helper it gives me marely 200 to 500bytes per sec speed also it stops i have to pause play what can i do i tried IE 8 firefox google crome but nothing help
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