Bcedit

Now you have 15 seconds to choose your OS.

One wrong parameter can render your PC unbootable. Backup is easy: bcedit

bcdedit /set {bootmgr} displaybootmenu yes Now you have 15 seconds to choose your OS

bcdedit /set hypervisorlaunchtype off

Note: This is a security risk; turn it back OFF when finished. bcedit

Mastering BCEDIT: The Power Tool for Windows Boot Configuration