I realize there was another thread based on this, which suggested I create a new account, and it works, but I have billions of data, settings and apps in my old account that I've accumulated over three and a half years of use. I've tried to set this one to a non-admin account, and re-admin it, but to no avail. A popup box with no content briefly flashes onto the screen, but then disappears and doesn't let me log in. This is through Cortana, mail, calendar, the settings app and just about anywhere that lets me log in through MS Account. Anyone have a solution other than moving everything?