Enable F8 Boot Menu Windows 8 and Windows 10

Microsoft did away with the advanced start up menu by default with Windows 8 and Windows 10. However there is a way to get it back! In order to perform this task you must either boot the system to windows or if you are having issues booting (which is likely what brought you to this) then you must boot from a Windows 8 or Windows 10 DVD. Once into the system or booted from the cd you will launch a command prompt. This is listed under the repair options if booting from DVD.
Once you are at the command prompt type:

bcdedit /set {bootmgr} displaybootmenu yes

to enable the advanced start up menu (F8)

or

bcdedit /set {bootmgr} displaybootmenu no

to disable the advanced start up menu (F8)