Microsoft confirms problem with Windows 10 update halting systems from starting
Microsoft has confirmed an issue with the latest update for Windows Defender for both Windows 10 and Windows Server 2016. The update was released earlier this week and due to the issue, some Windows 10 systems with Secure Boot will no longer start.
The update can also cause issues with AppLocker, if it’s activated it can block downloads in some cases reports MyCe. German Windows Expert Günter Born reports about the issue after some of his users alerted him about the problems.
Microsoft has confirmed the issues and provides workarounds that should solve both the AppLocker and SecureBoot problems. Besides the issues with this particular update, Born also reports that Microsoft had problems with its update servers after which users started to report about error messages when they tried to update.
The workarounds involve changing the allowed paths in Windows and disabling SecureBoot and require some manual typing. More information can be found on the Microsoft website.
There is a workaround and that means that secure boot is switched off, after which the update is reversed. Here are the steps that you should take according to Microsoft:
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Restart the device, and enter the BIOS.
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Turn off Secure Boot, and then restart the device again.
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In the administrative Command Prompt window, run the following command:
"% programdata% \ Microsoft \ Windows Defender \ Platform \ 4.18.1901-7 \ MpCmdRun.exe" -revertplatform -
Wait for one minute, and then the following:
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Run sc query windefend to verify that the Windows Defender service is running.
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Run sc qc windefend to verify that the Windows Defender binary no longer points to version 4.18.1901.7 .
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Restart the device, re-enter the BIOS, and then turn on Secure Boot.
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Senior Member
Posts: 12162
Joined: 2014-07-21
Windows updates screwing around again? Really, m$?

Senior Member
Posts: 7042
Joined: 2010-08-28
Defender is disabled for me cuz i use NOD32.
Senior Member
Posts: 3302
Joined: 2011-11-24
Your computer can't get infected if it doesn't boot.
Senior Member
Posts: 1083
Joined: 2013-02-22
This update has been annoying me for about a week now it does its thing asks for a restart and once it restarts it shows like there's no boot drive after power off it starts up again and repeats. It's fine because it's on my secondary computer and as long as I dont restart it works but at least I know how to fix it.
Senior Member
Posts: 719
Joined: 2004-09-20
Wow...jest wow...