Thanks for contacting me.
1st Connect the Android to the PC/Laptop. (The USB will fail to install).
2nd Pull down the screen of the phone. This will reveal 3 menus: a) Connect as USB Device, b) Connect as Media Device and c) Connect as Charge only.
3rd Select the button for Connect as Media Device.
You should be able to use this to synchronise your device with the pc.
WARNING: Beware of downloading software onto your pc to resolve this as most of these are viruses and spywares. I know because I experienced it!!!!
Please let me know if it works for you.
Good luck