You have an old computer and you want to boot that computer with your usb memory and install the program? then you are in the right video. I told you how we found an old computer and did the boot job. I hope you will handle it in the same way.
By applying the settings I made in the video I prepared, you will be able to start your old computer with a USB stick and format it. If the brand of the USB stick you will format is sandisk, it does not appear on the boot tab in the bios because the brands of the sandisk appear as hdd in the boot tab instead of external usb.