Steps for home versions of Windows that don’t have the group policy editor. Steps for professional and higher versions of Windows that have the group policy editor included: You can use the group policy editor to disable this behavior (you will still have to restart at some point to finish installing patches but it won’t happen automatically). Your PC will automatically restart the next time you sign in. Otherwise, you should take a moment to save your work. If you've already saved everything, you can restart now. To finish installing important updates, you need to restart your PC. Your PC needs to restart to finish installing important updates.

You will receive a banner message box with text such as this: Restart in 14 minutes, 59 seconds

Windows 8/10 has initiated the process to install patches and updates but needs to restart.