Error message on iTunes when syncing iPhone 4s

When I plug in my iPhone 4s to my computer and access iTunes, an error message pops up, "This iPhone cannot be used because the Apple Mobile Device service is not started."  My iPhone doesn't show up on the left side as a device.  This just started happening, but nothing has changed that I know of.  Any ideas?  I can't download updates from iTunes or download purchased music to my phone.

The Apple Mobile Device Service normally starts when the computer starts, but sometimes you can have problems. Check this Apple support document with instructions on how to restart the service.
http://support.apple.com/kb/ts1567
As one other poster said, next time you start the computer, it should restart on its own.

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