Update iTunes
Check that you have the latest version of iTunes installed on your computer.
Make sure your iOS device trusts your computer
If you connect your iPhone, iPad, or iPod touch to your computer and see "If you have not connected your iOS device to this computer before, unlock the device and tap Trust," make sure that your device trusts the computer.
If you use Windows XP and you see the trust alert on your device repeatedly, make sure that you installed iTunes.
Check the USB cable
Verify that the 30-pin to USB cable or Lightning Connector to USB cable is free of debris and not damaged. If another cable is available, test with that cable instead.
USB cables that are bundled with third-party products or accessories might work only to charge those products and might not transmit data. Also, if you're using a third-party case or extended battery pack, try removing the case and connecting the Apple-supplied USB cable directly to your device.
Verify that Apple Mobile Device Support is installed
iOS devices require Apple Mobile Device Support, which should be automatically installed with iTunes. To verify whether it is installed, follow the steps appropriate for your Windows operating system below.
Windows 8
Move the cursor to the upper-right corner and click the magnifying glass.
Type Control Panel, and press Return.
Click "Uninstall a program."
Verify that Apple Mobile Device Support is visible in the list of currently installed programs.
If Apple Mobile Device Support isn't listed, remove iTunes, QuickTime, Apple Software Update, Apple Application Support, then reinstall iTunes.
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