Thank you Boggin. When I run the cmd you suggested (I've tried both Cmd Prompt admin and Powershell admin), I don't get any errors, but a pop up "i" window opens with a glossary of switches for the wusa command. The PC doesn't auto reboot, so I wonder if the cmd ran. I'm going to manually restart now and see if anything has changed. Thanks. I will report if this removed kb4586864.