With a usb stick, you don`t change anything in the bios, you simply use the 1 time boot menu key to bring up the boot menu, then you just choose the usb stick. You should never get the word "Press any key to boot from CD/DVD" If you make any changes in the bios it will boot from the usb stick over and over again, you only choose the usb stick 1 time using the boot menu screen.