Why won't my iTunes connect with my iPhone?

I try to connect my iPhone to my computer to sync to iTunes but then a little window pops up that reads "This iPhone can't be used because the Apple Mobile Device service is not started." What does this mean and how do I fix it?

Reinstall itunes And then open itunes manually and connect your iphone to itunes and wait. You sjould see your iphone appear if not look if your iphone is authoried with your computer. Also try Wi-Fi sync

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