Thank you for contacting the Intel Communities.
This is a known situation, Windows 7* doesn't have the drivers fro USB 3.0, this is the only USB revision available in the NUC and this would be the reason why you are getting this scenario.
Here you can find a possible workaround for this situation.
Also, you could access the BIOS and disable the xHCI feature from Advanced>Devices>USB. Then Install Windows 7* and install the USB 3.0 drivers, after that, enable the xHCI feature again.