Why does windows 8 keep uninstalling my ipod code 21

Does anyone know how to stop windows 8 from uninstalling my ipod (code 21)? I cannot download my music I have just bought on itunes because as soon as I click on 'my ipod' in itunes it disappears.

Hi Hellyrose!
Here is an article that can shed some light on the meaning of that error code:
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/ts3694
Check for hardware issues
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the alert when you update or restore, contact Apple support.
Common errors: 1, 10-47, 1002, 1011, 1012, 1014, 1000-1020.
Take care, and thanks for visiting the Apple Support Communities.
-Braden

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