If you have installed the updates that Microsoft released on this patch day you may have noticed issues with your machine afterwards.
Users on Windows 7 started to notice that Windows Defender would not start up anymore for example, and that the Diagnostic Tool of the operating system was not working correctly as well.
Some users reported that Windows would not start at all anymore and several other issues such as that the Microsoft Management Console would ask for admin credentials while logged in as an admin or that the installation of Microsoft Security Essentials failed.
The update that caused the issue this time is KB3004394. It is an update for the Windows Root Certificate Program which speeds up the updating of root certificates from once per week to once every 24 hours.
Windows users who ran into issues with the update had no choice but to remove it from the system again. This guide walks you through the steps of uninstalling Windows Updates and blocking them from being installed automatically.
Uninstall a Windows Update
The way you do that works similar in all recent versions of Windows.
It can happen that you cannot boot into Windows which is problematic as you cannot remove the update then using the method described above.
Options that you have at this point are to boot into Safe Mode if Windows boots still into it, or to use recovery media to run System Restore to undo the update.
Block Windows Updates from being installed
The update that you have uninstalled may still be offered to you via Windows Update. Depending on how Windows Update is configured, it may even be downloaded and installed automatically again.
It is possible to block individual updates from being downloaded and installed automatically.
Hiding the update blocks it from being downloaded and installed automatically. It can still be installed manually on the system though.
Our in-depth Windows Update guide offers additional information
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