Remembering to save all changes F10, then reboot.
The F8 is only a one time thing, you press F8, select what you want to boot from and away you go, next time the computer restarts it will boot from the original drive set in the bios.
I noticed that setting the boot drive in the bios is so complex now, on mine you got to menus, one for setting the hard drvie to boot from and then another for setting the devices order.
I remember a few years back when I used to always put the floppy and Cd drive as the first boot, Now I just put the hard drive as first boot. Needing to boot from optical drives is not needed these days unless you have to reinstall the Os.
Desktop machine now powered by windows 7 pro 64bit , laptop by ubuntu
On ADSL24 using C&W network.