OK, so no WSUS. The link in post #14 shows that there may be an issue with a Microsoft Update that is causing the problem. Windows 10 had a similar issue, so this is a definite possibility. Check the info at that link and then check for the presence of the offending update. If found, you can uninstall it, then set Windows Update to Notify you but NOT automatically download and install updates. When the update is listed as available, you can Hide it, at least until Microsoft fixes it, assuming that they do that. You could then try setting the Microsoft Update setting back to whatever it was previously, and hope that Microsoft won't Unhide that update for you and reinstall it.