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This is expected behavior because Windows 7 does not have integrated USB 3.0 driver only the USB 2.0.
Try following the steps at the following link to install Windows 7 with USB 3.0 ports
NOTE: These links are being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
Thank you for responding on a holiday. The NUC blogger guy sent me similar links. The actual Microsoft automated program that slipstreams the USB drivers to the stick did not work. I found a version by Gigabyte that did work. (And I also followed the steps in the first link you sent).
BUT, while keyboard and mouse are now active on the first setup screen, and file copy is fine, after the second automated reboot, its lights out AGAIN. Dead Keyboard and mouse, but now at the Setup Windows / name your computer screen.
How do the USB drivers work on the first screen, but not at continuation of setup after reboot?
I tried to manually load USB drivers at the hard disk partition screen, but the drivers I downloaded from the Intel NUC site fail to install at that screen.
I might buy a USB header to USB cable. Where are the USB headers on the NUC?
Try the Windows 7* USB 3.0 Creator Utility, some customers reported that they haven’t been able to successfully install Windows 7 with this unit using this tool but I was able to do it. Before installing the operating system follow the steps to use the 3.0 creator utility here:
URL Security Zones Cause USB Keyboard and Mouse to Fail During Windows 7* Setup
I’m just following on this thread to ask you if your issue was resolved with the information provided above or if you still need further assistance.