Neither is set to run Windows updates automatically. Both have the Servicing Stack updates installed. Not so Short Answer: I have two i5 machines (one called i51, the other i52), both Win 7 SP1, neither have Norton's/Symantec installed. Short Answer: If you haven't already done so, install KB3133977 first, restart the machine, then try KB4512506 again. We recommend that you do not manually install affected updates until a solution is available. Microsoft has temporarily placed a safeguard hold on devices with an affected version of Symantec Antivirus or Norton Antivirus installed to prevent them from receiving this type of Windows update until a solution is available. The Windows updates are blocked or deleted by the antivirus program during installation, which may then cause Windows to stop working or fail to start. Microsoft and Symantec have identified an issue that occurs when a device is running any Symantec or Norton antivirus program and installs updates for Windows that are signed with SHA-2 certificates only. This is a known issue with this particular update. Others are saying to install KB4490628, but my system says its already there. You should make sure you have all Windows 7 updates installed, except those that have been released in August 2019 updates (exluding KB4474419 since it was actually updated in August 2019). KB4474419 is also required in order to install updates signed by SHA-2 certificates. In other words, uninstalling and then reinstalling this required update (KB4490628), would not resolve your problem. Even if you were to uninstall it, the problem you describe, is a known issue with the version of Symantec Antivirus or Norton Antivirus you currently have installed on your system. KB4490628 is a Servicing Stack and it cannot be uninstalled. Windows does not give me the option on this update.

I can not uninstall KB4490628 to re-install it.

Kb4474419 windows 7