Start by pressing the 'esc' key to display the startup menu, and then press the F9 key. From the 'Boot Manager' window, you can now boot your laptop and have it run normally. If you need to get the BIOS setup options, press F10.
use another computer to install the boot file on a flash drive or get the boot disk, and put either one into the computer you want it on and follow the steps. I think f10 or f11 just after you turn it on will take you to the boot menu which will give a few more options.