Problem: You want to load some files onto your Nexus 7 but Windows 8.1 does not recognize it.
Solution: Control Panel → Devices & Printers → R-click Nexus 7 → Properties → Hardware → Properties → Change Settings → Driver → Uninstall (OK) → Unplug Nexus 7 → Plug Nexus 7 back in & let it reinstall the drivers
