This is the low-level software you can briefly enter when your computer is first starting up. It's usually accessible by pressing Delete or F12 when prompted during boot up.

If you don't have a retail Windows 7 disc, you received a Windows 7 operating system disc with your computer. Reboot the computer and press the appropriate key combination to bring up the boot menu.

If you are unable to open the Boot menu when pressing the F12 key in Windows 11/10, follow this easy guide to fix the issue once and for all.