Some change or update to Windows 8.1 Professional has caused Explorer to become incredibly slow. Right clicking a folder leads to a circular rotation cursor and a wait from 10-20 seconds before the right-click pop-up menu appears. Clicking on the arrow to the left of a folder leads to another circular rotation cursor and 10-20 second delay before the folder expands. Anybody have any idea what is slowing down Explorer so drastically ? I cannot recall anything I have done to cause this enormous unresponsiveness in Explorer and can only think that some Windows Update being automatically installed has done this.