Okay so I've got this pretty old computer that I would like to factory reset. Well I've got a USB, and an iso, and I would like to reinstall Windows ME (which is what it already has) or Windows 98. It's a Gateway but doesn't have a model number on it so I'm not sure what to say on that, it says "Designed for Windows 98 or ME" on the front so I guess it was built for both. So I've tried many google ways, but the problem is, I have no idea how to boot from USB. Since it's not DOS based, I can't just enter a command or restart in MS-DOS mode. I can't seem to find a way to boot from the BIOS. I just want it to be set to factory defaults, any help would be appreciated. Thanks.