I have had this problem on several Windows 7 pro computers. I have fixed all but a laptop. I Googled until I came upon a fix from some website that worked on two desktops. I can't get the laptop to recover for anything. Fortunately, it only has some pictures, but they are important. I'm afraid to turn the darn thing on now long enough to back them up. My original update problem with my office computer was caused by the update to 10 that was not supposed to happen. After Microsoft took it back to Windows 7 for me, it would not update until I found the solution myself. They were no help with the endless circle up never finishing updating.