Change startup settings · Access the Windows Recovery Environment · Once in Windows RE, select Troubleshoot > Advanced options > Startup Settings > Restart.
Tap the F12 key until you see the One Time Boot Menu . Select the Windows recovery or installation media from the list and press the Enter key. Windows ...
You'll need to press a key during boot to enter the boot menu, this depends on the motherboard you have but typically it's one of the function keys (eg F10 or ...