Actually, these came with Windows 7 and then also have the 10 disc.
But, honestly, RUFUS isn't the issue, the BIOS/UEFI is. They aren't even showing up when ESC/F9 is hit. They can't even been selected. Other machines these boot just fine and install the OS. It's something with the BIOS that is causing this.
I have used diskpart and did what you suggested, and even tried FAT32 to no avail.
