Try on another computer to help determine if computer or iPod problem Troubleshooting issues with iTunes for Windows updates Run this and see if the results help with determine the cause Then reinstall all the Apple software components However, after your remove the Apple software components also remove the iCloud Control Panel via Windows Programs and Features app in the Window Control Panel. Removing and reinstalling iTunes and other software components for Windows Vista, Windows 7, or Windows 8
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP IOS: Device not recognized in iTunes for Windows Does iTunes see the iPod? If it does not see it: