Boot and install from a USB device using UEFI Support NOT Legacy mode
When you see that dreaded blue boot missing message and can now only boot from 'Legacy' but you prefer 'UEFI', this video is for you. The video will show you how to make a bootable USB Drive using UEFI Support.
However, you will need to download on a working computer you will be using the software you want to install (eg, Windows) before following this video.
DISCLAIMER: THIS METHOD WAS UP TO DATE AND WORKING AT THE TIME OF RECORDING AND UPLOADING. I DO NOT HOLD RESPONSIBILITY IF THIS METHOD DOES NOT WORK OR IS OUT OF DATE IN THE FUTURE.