oh, ok you want to install from an external optical drive. yes you can, but it might take all day lol you just have to go into bios, enable the plug-and-play boot from usb, make sure the usb ports are enabled, and connect the external drive to the fastes usb you have, either 2.0 or 3.0. and he might want to do this if his build doesnt have an optical drive, would be my guess.