Help me, my ipod doesn't detect from itunes

I updated my ipod, but it appeared to me error and now the ipod asks me to be connected to itunes but itunes does not detect it.
how can I do?
windows PC

Error 20, 21, 34, 37: These errors typically occur when security software interferes with the restore and update process. If you are using a PC, follow this article to resolve this issue.
http://support.apple.com/kb/TS3694#error21

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    Then I connected the iPod, which now told me that I had an old version and needed to update, which I did.
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    In iTunes, go to the File Menu and select the 'Add to Library' option.
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