Over the past 2 months, Windows update (Win 8.1, HP Pavilion) has failed three times. After selecting the recommended downloads, the PC goes into a permanent loop of updating, restarting, failure to update, return to previous configuration and then attempting to install updates again with subsequent failure & endless loop. I have to use the 3-finger salute to interrupt and regain control. I have currently disabled automatic update. This odd pattern occurred last fall with my Vista laptop (Toshiba), but after ignoring all updates for about 2 months and then re-enabling updates that laptop seems fine & recent updates have gone smoothly. Now the problem is the Win 8.1 PC and its inability to install updates. Suggestions?