How do I deauthorize a dead computer
How Do I deathorize a dead computer and transfer my old itunes library to a used computer.
iPod nano, Windows XP
There is no need to deauthorize unless you've reached the 5 computer max. If you have reached that max, deauthorze all computers and then authorize the one's you actually have.
As for moving the library, use the backup of the computer to move all the content to the new computer.