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11 Nov 2015 Windows Critical Update KB3097877 Crashes Windows Sidebar
Just went through the second Tuesday update cycle and when all five computers restarted, sidebar.exe crashed during boot up, and kept crashing on repeated restarts. Dropping back to the restore point just prior to the update cycle restored proper Windows Sidebar operation. As there were over two dozen critical updates between Windows and MS Office, it took some work to isolate which update broke the Windows Sidebar. I've been able to replicate installing KB3097877 crashing sidebar.exe and uninstalling it restores proper sidebar function, on two laptops and two desktops, all with Windows 7 Pro or Windows 7 Ultimate /x64 . . . although I don't believe the Win7 variant makes any difference.
Even if auto updates are turned off, Windows insists on trying to install KB3097877 during Shutdown (i.e. when you turn off the computer). The only way to prevent it from being reinstalled (and breaking the sidebar again) is to select and hide this update in Windows Update.
John