We are aware that Microsoft has identified the compatibility issues with antivirus vendors due to the fundamental changes of memory management with the latest Windows Security Update in January 2018.
Important information regarding the Windows security updates released on January 3, 2018 and anti-virus software: https://support.microsoft.com/en-us/help/4072699/important-information-regarding-the-windows-security-updates-released
All 5nine Cloud Security and 5nine Manager Standard with Antivirus customers automatically receive the latest signatures updates directly from the antivirus vendors' servers. You can review the current state of the security update support via the following links:
Support has confirmed when the following registry key is present on the system:
Key="HKEY_LOCAL_MACHINE" Subkey="SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat" Value="cadca5fe-87d3-4b96-b7fb-a231484277cc" Type="REG_DWORD”
Windows Security Update is only going to become available and apply to the system, once this registry key is set by the antivirus engine.