Windows Security [Microsoft Defender] has started throwing error messages in Event Viewer, in Windows 10 Pro 64-bit, both version 1909 and 2004, apparently in the latest Defender Platform 4.18.2007.8:
Event 7001: “The Windows Defender Antivirus Network Inspection Service service depends on the Windows Defender Antivirus Network Inspection System Driver service which failed to start because of the following error: The supplied user buffer is not valid for the requested operation.”
Event 7000: “The Windows Defender Antivirus Network Inspection System Driver service failed to start due to the following error: The supplied user buffer is not valid for the requested operation.”
The only fix found so far is to disable Core Isolation and Virtualization Based Security, by going to: Windows Security->Device Security->Core Isolation->toggle off memory integrity. Then, on reboot, the above errors stop.
This is discussed in two places:
https://www.tenforums.com/antivirus...r-network-inspection-service-fails-start.html
and
Windows Defender Antivirus Network Inspection Service issues since Windows 10 2004 update
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