I installed Windows 10 several days ago. It seemed OK; then I added another pc to my network and when I finished my user account had been deleted. Administrator privileges were given to an old account for which I no longer have a password. My only access to my computer is as 'guest'. My user name has vanished along with all administrator rights. I can't restore. I can't even wipe my hard drive. Window 10 is the gateway to bizarro world.