First try updating your iTunes
First, open up iTunes. Then, click the "Help" tab on the main menu, and click "Check for Updates" you should be prompted with "A new version of iTunes is available. Would you like to download it now?", then click "Download iTunes"
Try restarting your computer, if that doesn't take, try this
create new user account on computer - administrator.
open itunes
connect usb to computer but not on phone
power off iphone
hold the home button and connect cable to phone - kepp holdong home until you see the itunes icon on iphone screen
- once on computer screen , you will see that iphone is in recovery mode , let go of home button
- click restore on computer screen
- set up the iphone as new - do not restore from itunes backu up or icloud-
- after you set up as new and on home screen on iphone - then restore from back up
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