I recently attempted to reinstall windows 10 on my OptiPlex 3020, but it corrupted so I have to do a clean install. I made a bootable usb with rufus,(x64 bit installation, gpt, fat32.).

When I try to boot onto it using f12, it gives me an error saying, "selected boot device failed. press any key to reboot." 

I have UEFI boot on, and secure boot, but the usb drive only reads in legacy mode for some reason.

I'm not sure if the problem lies in the USB drive, or the computer, but any and all help would be appreciated!