This month’s Windows and Office security patches: Bugs and solutions

It was the kind of month admins dread: Mysterious problems on hundreds of machines, with no apparent cause or cure. Toss in the holidays, and we had a whole lot of Mr. and Ms. Grinches in the industry.

Fortunately, it looks like the problems have been sorted out at this point. Individual users had many fewer problems. Microsoft’s left and right hands still aren’t talking on the 1909 team, but what else is new…

Win7 hang on ‘Preparing to configure Windows’

Microsoft dropped a new Servicing Stack Update for Windows 7 on Dec. 10, and it gummed up the works for many. Here’s a good summary on Reddit from poster Djaesthetic:

“We had over 100 Windows 7 Professional endpoints all stuck on “Preparing to configure windows” screen. We couldn’t get beyond that error in any simplistic manner. We eventually got a remediation to get beyond that error (involving booting each one from an ISO and making several registry hive edits to TrustedInstaller). Unfortunately, even after we were able to log in, the entire OS is functionally broken….

“…We are having this same issue on 111 different Windows 7 machines, each one consistently having the same environment problems. We are unable to roll back the KB4530734 Windows Update, likely because the Windows Module Installer (TrustedInstaller.exe) service itself is broken… I’ve been working non-stop all weekend. Currently waiting for (yet another) callback from Microsoft….

As Djaesthetic later posts, the problem is triggered by the Dec. 10 Servicing Stack Update, KB 4531786:

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