If your computer won't restart after installing Windows Update, you will have to boot into Advanced Options (WinRE) screen and take any one of these steps.

Fixing the Windows Infinite Reboot Loop: A Step-by-Step Guide If your Windows computer is stuck in an infinite reboot loop, it can be frustrating and challenging to resolve.

Hopefully, you’ll never have a PC problem to troubleshoot, but if and when you do run into problems with a Windows computer, Safe Mode will be one of the most useful tools in your toolkit.