Just to mention that the latest update on Windows 10 appears to have created numerous problems for folk.
In my case:
a) the order of boot set-up was altered so the PC was attempting to boot up from the printer(!) - I managed to find a temporary work-around.
b) the Windows start menu failed to display when prompted
c) various apps failed to launch from the desktop / taskbar
b) and c) appear now to have been put right by a further update, but a) was more problematical and I've had, with the help of our computer guru, to make a permanent fix via the BIOS set-up.
Just saying this in case others with PCs are having similar problems.
I think WM mentioned a while back that he doesn't have "automatic updates" turned on - this is now sounding very sensible …