If an iPhone or iPod touch is not recognized in iTunes on Windows, the Apple Mobile Device Service (AMDS) may need to be restarted. If AMDS cannot be restarted, you may need to remove and reinstall the service. This document is for Windows XP, Windows Vista, and Windows 7. If you have a Mac, follow the steps in this document.

Originally posted here:
iPhone and iPod touch: How to restart the Apple Mobile Device Service (AMDS) on Windows

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