How to make notebook boot from USB

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http://askubuntu.com – I would like to install Ubuntu using a live USB. I created the bootable USB following instructions from http://www.ubuntu.com/download/help/create-a-usb-stick-on-windows with another laptop running Windows. My notebook came without an OS. I've inserted the USB and pressed Fn while it starts up. When I turn it on, it shows the manufacturer splash screen, then the following options: 1 - Load FreeDOS with maximum RAM free, using EMM386 2 - Load FreeDOS including HIMEM XMS-memory driver 3 - Load FreeDOS without drivers Enter a choice: [ ] F5=Bypass startup files F8=Confirm each line of CONFIG (HowTos)