windows closing automatically

AFTER AN AUTOMATIC UPDATE THE TABLET KEEPS SHUTTING DOWN, I TURN IT ON BARELY HAVE TIME TO LOG IN WHEN IT AUTOMATICALLY SHUTS DOWN, HAVE TRIED EVEYRYTHING. IT GOES THROUGH THE BOOTING PROCESS, AND IMMEDIATELLY AFTER STARTS SHUTTING DOWN.. CAN ANYONE HELP? Please.....

Hi This problem started in the past week - first the bottom right button stopped working, then it starts to randomly close open windows, even while I am typing in them. Had an antivirus installed...checked for viruses, nothing... researched a bit online and it suggested a factory data...