iPod 5th gen not showing in iTunes after error-check
I found the following answer and it has worked!


  http://forums.ilounge.com/windows-ipod-discussion-problems/160623-ipod-not-being-detected-itunes-updater.html#post920916


In brief, the solution is to:


Disconnect the iPod.
Uninstall iTunes and iPod Updater and reboot.
Hold down the Center and Menu buttons until the Apple logo appears on the screen (i.e., force a reboot).
Connect the iPod.
When the iPod appears in Disk Management (My Computer > Manage > Disk Management in Windows XP), format it as FAT32. Do not use Quick Format.
Install iPod Updater (not iTunes) and restore the iPod.
Reinstall iTunes and refresh iPod contents as desired.