Windows 10 install stuck at "Installing update 115 of 194" after over 24 hours. Mouse unresponsive, but little circle continues to revolve. Keyboard unresponsive. Two little white dots after "194" keep flashing and move to the right three times then come back to the original position. I understand that a solution could be to turn off the Automatic Update. I would do that, but am unable to get off the screen where I'm hung up. The screen says, prior to the "Installing Updates etc., "Please do not power off or unplug your machine". I admit my almost total lack of sophistication and I am afraid of stopping the completion of the upgrade to Windows 10.