I took home my friend's Acer Aspire 5250 which currently has corrupted Windows 10. So, I thought of installing Windows XP (SP3) in it using a bootable USB. As of now, it doesn't pick the USB. I don't have any Windows CD so USB is the only option. It is running on InsydeH20 Setup Utility Rev. 3.5 and I tried finding the Safe Boot and Boot Mode (UFEI, etc) options but they are not there. It doesn't load the already installed Windows 10 neither picks up the USB, I'm stuck.
You could try disabling the UEFI in BIOS menu by pressing F2, as soon as it boots up, on Boot tab choose Legacy instead of UEFI, after that choose boot priority order and make your USB device be first priority, still in BIOS menu go to main tab and enable F12 boot menu (if needed -just be be sure to select correct USB device) then reboot. Press F12 during boot and now you can see your USB device, you can proceed with installation of OS.