This error occurs when the device unexpectedly loses its USB connection with iTunes. This can occur if you manually disconnect the device during the restore process. You can resolve this issue by using USB troubleshooting, using a different Dock Connector or Lightning Connector to USB cable, trying another USB port, restoring on another computer, or by eliminating conflicts from third-party security software.
try to use a stand PC and connect your iphone to the rear usb port. disconnect all usb hubs, printers or other stuff. keep only mouse and keyboard connected to pc if needed.
on your laptop check your usb driver or any issue in hardware sections - update your windows if needed
---- try a different usb cable - at least your original cable
---- turn off you security software e.g. kaspersky and all other software that might blocking itunes to communicate with your iphone