You need to add the USB 3.0 drivers to the installation.Creating an ISO from the DVD would not work with the USB/DVD Download Tool. You need to transfer the Windows 7 installation to a bootable USB drive.Therefore, you cannot use a USB mouse or keyboard during installation.
Windows 7 doesn't support USB 3.0 on the installation disks.You can purchase it here: USB A Female to 1 X 4 Pin Internal USB Connector 1.25 mm Pitch The internal ports require a non standard 4x1.25 mm header to USB adapter. NUC6i5 has four external USB 3.0 ports and two internal USB 2.0 ports.I was able to get Windows 7 圆4 working on the NUC6i5SYH.