ok so drop all security software and firewall on your windows computer.
unplug all other usb devices
open itunes in safe mode under a new user
try this then
open itunes on computer
plug cable into computer not iOS device
turn device off
hold home button and plug cable into IOS device. do not release home button until an itunes graphic appears on IOS device.
look to computer should have message about recovery mode click ok and restore
if u need an article see
iPad: Basic troubleshooting
Update and restore alert messages on iPhone, iPad, and iPod touch
iOS: Resolving update and restore alert messages
iPad: Unable to update or restore
iTunes: Specific update-and-restore error messages and advanced troubleshooting
If you can't update or restore your iOS device
Check for hardware issues
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the alert when you update or restore, contact Apple support.
Common errors: 1, 10-47, 1002, 1011, 1012, 1014, 1000-1020.