Steps for Windows® 7 installation on Intel® NUC Kits 5th generation.
Go to BIOS
Enable UEFI and Legacy boot options at Boot tab.
Enable USB Legacy and disable xHCI at Devices>USB tab
xHCI disables USB3.0; however, we can activate the option after installing OS and drivers.
Plug USB bootable drive (Win7 installed) to the NUC and restart the NUC, keep tapping F10 and select the option UEFI – USB bootloader.
It is recommended to format the 2.5” Hard Disk Drive or M.2 SSD.
mSATA drives were supported on previous NUC versions, such as, D34010WYK or D54250WYK.