Microsoft confirms problem with Windows 10 update halting systems from starting

by Hilbert Hagedoorn on: 02/04/2019 09:10 AM | source: myce | 92 comment(s)

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:

Restart the device, and enter the BIOS.
Turn off Secure Boot, and then restart the device again.
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:
- Run sc query windefend to verify that the Windows Defender service is running.
- Run sc qc windefend to verify that the Windows Defender binary no longer points to version 4.18.1901.7 .
Restart the device, re-enter the BIOS, and then turn on Secure Boot.

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