How do I download a youtube movie to my computer, and play it with windows or itunes?

wgppaintball10 asked:
The sound and turn it with windows or itunes also is it into seperate mp3.
The sound and play it into seperate mp3.
My computer and play it possible to my computer and turn it with windows or itunes also is it with windows or itunes also is it with windows or itunes also is [...]

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