Shut Down doesn't shut Windows down. Restart does.

You turned it off and on again and the problem is still there. There is a reason for that, and it has been sitting in Windows since Windows 8.

The feature is called Fast Startup and it is on by default. Microsoft's own driver documentation spells out what happens: when you pick Shut Down, Windows closes your programs and logs everyone off as usual, then saves the kernel memory image, including the loaded kernel-mode drivers, into the file Hiberfil.sys before cutting the power. Switch the machine on again and it does not build a fresh Windows. It loads that file back into memory. Much quicker, and the reason a modern PC reaches the sign-in screen in seconds.

The catch follows from it. A driver that has wedged itself, a service that quietly fell over, a memory leak halfway through eating your RAM: none of that gets cleared by a shut down, because the session it lives in was never closed. It is preserved and restored along with everything else. Restart works differently. It ends the kernel session properly and boots cold, which is why support people ask you to restart rather than to turn it off.

So when something is misbehaving, use Restart from the Start menu rather than Shut Down followed by the power button. If you want a genuine full shutdown, type shutdown /s /t 0 into the search box and press Enter; that skips Fast Startup. Microsoft does not suggest switching the feature off permanently, and nor would we, because the speed is real. This is also why several of Tendvane's repair wizards finish by asking you to restart rather than declaring victory on the spot.