Authorization - have searched many times and nothing works!

Okay so I've recently acquired a used ipod from a friend. She had restored it on her computer before giving it to me. When i plugged in the ipod, it sync'd all of my songs except in the purchased section, it sync'd 16 and said I wasn't authorized to play the other 47 on my computer. On my other ipod, this doesn't happen.
I have tried restarting my computer, I've tried to download the newest version of itunes but ever since I've had itunes it says there's been an error installing, but this is nothing new. Anyways I still have version 9.
I've deauthorized and reauthorized itunes on all my computer's accounts. I've deleted the SC file or whatever that is.
I've also tried restoring this second hand ipod again, but it says it cannot restore due to unknown error (1430 or 1436).
What should I do?
Thanks!

anybody??
Nothing seems to be working!

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