I recommend you use “E.M. Youtube Video Download Tool”.
Download video from YouTube, yahoo, Google video, iFilm, blogTV, Putfile, Metacafe, DailyMotion, …
it is a very strong tool, it can Download, Convert, Burn, Search, Manage, Repair and Play YouTube videos Capture RT MP Video Streams.
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Download Youtube Video Software - E.M. Youtube Video Download Tool-YouTube Video Download