Windows Vista and 7 will sometimes force you to install Windows Updates when shutting down by removing the “Shutdown’ button and adding “Install Updates and then Shut Down computer”. However, you can ensure the plain “Shutdown” button will always appear by creating the following Registry entry:
Hive: HKEY_LOCAL_MACHINE
Key: Software\Policies\Microsoft\Windows\WindowsUpdate\AU
DWORD Name: NoAUAsDefaultShutdownOption
DWORD Value: 1
