Administrator restriction after install KB5019959

Gilleso365 36 Reputation points


After installing last update KB5019959, many user of our Organisation can't open many applications Like Teams or other. The message "System Administrator blocked this app". We can't open Windows start button etc...
We can't uninstall the KB because windows taskbar and windows update menu is blocked too.
Please help.

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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  1. Nergal Grey 121 Reputation points
    6 people found this answer helpful.

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  1. Nav 1 Reputation point

    Security Setting, and therefore "Local Security Policy" and "AppLocker" settings are not available post KB5019959 and therefore I am unable to use the methods described in or
    For now, I have been able to revert the PC back to a restore point prior to the latest windows update.
    Please advise.
    Hope MSFT fixes this obvious issue.

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