In the office two Dell Inspirons 660. A colleague decided to update both from Windows 8 to Windows 8.1 while I was away. He updated his own one without a problem. However when he accessed mine he said at some stage of the process he was asked for a password and email address and inserted his own. This seems to be the case as I now find I can’t get into the computer with my own password but can with his.
In any event the START function (on bottom left corner) has disappeared. And the List of Options (settings, power etc) which appears when you swipe the right side lower corner is also gone into the ether. How do I recover these? Or how can I return the computer to Windows 8.