Microsoft has decided to remove a mandatory “registry key requirement” it introduced in the aftermath of the Meltdown and Spectre vulnerability disclosure. BleepingComputer: Microsoft used this registry key to prevent Windows updates from being installed on computers running antivirus software incompatible with the Meltdown and Spectre patches. Antivirus vendors were supposed to create this registry key on users’ computers to signal that they’ve updated their product and will not interfere with Microsoft’s patches. This was a big issue because incompatible antivirus products would crash and BSOD Windows systems. […] The OS maker removed the registry key check for Windows 10 computers last month, in March, and has announced yesterday that the key is no longer necessary for other Windows operating system versions — 7, 8, 8.1, Server 2008, and Windows Server 2012.

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Source: Slashdot – Microsoft Removes Antivirus Registry Key Check for All Windows Versions