Go into your iphone settings then >general and scroll to reset> and reset your network settings. Phone will restart, open itunes and plug in phone, allow acess and whalaa your phone will be recognized....
Connect your iPad/iPhone/iPod to your PC
Go to: Control Panel > Device Manager
Click on: Portable Devices
Right click on: Apple iPad/iPhone/iPod > Update Driver Software
Choose: Browse my computer for driver software.
Go to: C:\Program Files\Common Files\Apple\Mobile Device Support\Drivers