Please check the followings:
1. Check if you have downloaded the latest version of iTunes.
2. Check if your iPhone/iPad/iPod can be detected by iTunes.
3. Check if your iOS device is available.
4. Check if your iDevice screen is unlocked. Since the locked screen will ban the authorization between iOS devices and PC.
5. Check if you are using iOS 6.0 or above. If it is lower than iOS 6.0, your device cannot be recognized by TuneFab WeTrans.
6. Check if your iCloud is available. It should be turned on when your iOS devices is connecting with the computer.