If you are running Windows on Apple hardware, be sure to update the bootcamp software to the latest version. Specifically, make sure you are running bootcamp 5 or newer. If you are running Windows 7, after you have bootcamp 5+ installed, please verify that you can locate the Intel USB 3.0 host controller in the device manager list under "Universal Serial Bus Controllers." If you can not locate that device, there may have been an issue installing the bootcamp drivers. In that case, you can try to manually install the USB 3.0 drivers by downloading the bootcamp zip file from Apple, extracting it, and locating the Intel USB 3.0 driver installer below: