The Gateway is a nice machine. It works good.
To change the firmware settings the user has to get into the firmware via the recovery menu deep inside Windows 10.
Once you get in the firmware there is a option to put it in a legacy mode. After that you can them boot up an alternative OS install device.
Short story. I wipe the hard drive and install Windows 7 64 bit.
Then Windows 10 64 bit. The drive is GPT and has a set of extra partitions.
Now I can boot either windows10 64 bit or Windows 7 64 bit.
All of the original installed software is now gone. No loss for me, I did not want Office 365 anyway.
Again, I am not happy with the way Gateway hides the firmware options. After all this, I still do not know of any key press that will start the firmware. I cal use f12, but that only works because I had gone in and set the legacy mode.
Here is a method the will get you into the firmware.
Turn off the computer and remove the power cord.
Open the case and unplug the hard drive.
Turn power back on, you will get taken into the firmware. Once there set the boot order options for removable drive and allow the boot menu option. Also turn on the legacy mode. And disable quit boot, You need to see what's going on.
Power down the computer, connect hard rive, power up.
keep tapping the F12 key until you get a boot option menu.
I will left it in the legacy mode because I am the only person that ever uses this computer and this is inside my home.
Maybe this design co was meant to prevent security trouble in a business environment where many people might have time with the computer.