This problem or possibly non-problem happens apparantly on two laptop Toshiba computers, with Windows Vista. Once in a while when not doing any Windows Updates, but much more often when click to Restart after using a Windows Update Standalone Installer. An update installer finishes, I choose to Restart, some configuring of updates occurs, Windows then moves to the Shutting Down... screen, and the disk lamp indicator flickers erratically but the computer will either not shut down, or it will shut down after maybe SEVERAL MINUTES.
I've been finding that in this situation, forcing the computer to turn OFF using the power button turns off computer (button needs to be kept depressed several seconds until it turns off), and resting for several more seconds, and then pressing the power button to make a fresh startup, leads to a startup and then goes into the last stage of the Configuring Updates stage, and usually, no problem.
None of this is usually necessary on a couple of other computers here (one being laptop Windows 10 and other being tower/desktop with Windows 10).
Would this situation of forcing the machine to turn off using the power button kept depressed harm any of the Windows Updates? So far this seems not to be a problem.
Other question is, could this be evidence of some problem, the fact that computer even if not done as part of Restart for a Windows Update, with the computer - that it would become stuck at "Shutting Down..." ? Again, this seems not to be a problem, since both affected computers generally function or operate normally.