It just happened to me as well. Everything on the desktop is gone. Including the toolbar at the bottom of the screen with the start menu. Also there is no right click available. The only way I was able to even get to my browser is because it was already open and I had to hit ctrl/alt/del to open up the task manager and open it from there. *****UPDATE***** Restarted the computer and it all came back. Restart was really slow. Seems all good now.