Symptom: Shutting down, shutdown screen would start then hang and required me to hard power off. Solution: I had uninstalled the Windows Fax and Scan option in the Turn Windows Features On/Off from the Programs and Features section of the Control Panel. When I did that, it did not uninstall the Fax device in the Devices and Printers. Rechecking the Windows Fax and Scan corrected the situation. On another PC, I had removed the feature and then removed the Fax device from the Devices and Printers manually and that PC never had the shutdown hang problem. I don't know if this corrects other issues of shutdown hangs but it might give you ideas of what to look at if you suffer from this issue. I wished I had figured it out before I did a reinstall!