Re: Windows Schrödinger edition
Disabling the Windows Update service and manually unplugging your internet connection might help when you shutdown or sleep your PC.
It's the only way to be sure that nothing happens the next time you start using your PC.
The unplugging the internet will work. Disabling Windows Update, maybe not. Windows 10 has "self healing" updates, which is MS-speak for "We will find and remove your tricks aimed at regaining control over updates." I think there's a task in the Task Manager that you can find and eliminate, but each time Windows does update (should you allow it), you can expect all of these things to be put back, and you'll have to go through and undo them all again.
As Joshua would say, it's a strange game.