If your Windows 11/10 PC shuts down while installing or uninstalling a program, you need to follow the solutions mentioned in ...

If you have an old RAM ... a restart is pending for installing Windows Update, and it is already scheduled, your PC might not take permission to shut it down even when you play games.

Rather than restarting to finish the update, it was leaving the PC shut down and finishing ... long-standing Windows bugs here. (Though I really can't guess why a slightly old BIOS would have ...