Robert418
For a Downgrade you must delete the Windows 8 Partitions
And set the BIOS F10 Secure Boot disabled and activate Legacy Boot
Or you can install the System with a windows 7 ISO
Download Windows 7 Home Premium SP1 64Bit X17-58997.iso burn it
ISO to USB
For the Key use a Keyfinder
http://www.magicaljellybean.com/keyfinder/
You find the Drivers here