I'm guessing there is no space after "start=" and "auto" but I have not tried it.
I was able to use the system management console to check and modify the parameters others have suggested, and my "problem system" is now functioning properly with all pending Windows 10 updates installed. There are some anomalies in the pages under 'update"
in the Windows 10 UI Windows Settings, Update & Security, list of installed updates, but they do not appear under the dialog which allows you to select and uninstall updates where everything is listed correctly with install dates that make sense to me.
My problems began with a problematic update dealing with Adobe Acrobat Reader in November of 2017. Apparently I may have had an instance of Adobe Reader DC installed that was not correctly recognized as my default reader, or the fact that I had set it as
my default caused an "issue" with Microsoft's efforts to insure that some threat identified in the "standard reader" that they have tried to "take over" from Adobe in recent browser wars between Edge, Chrome, and Firefox. I'm still somewhat vague about what
that update was trying to accomplish. It was superseded in February 2018 with more Adobe related changes.