Hello, I'm looking to apply MS update KB4056898 (see here: https://support.microsoft.com/en-us/help/4056898) It says.. Due to an issue with some versions of Anti-Virus software, this fix is only being made applicable to the machines where the Anti virus ISV have updated the ALLOW REGKEY." and.. Contact your Anti-Virus AV to confirm that their software is compatible and have set the following REGKEY on the machine Key="HKEY_LOCAL_MACHINE"Subkey="SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat" Value Name="cadca5fe-87d3-4b96-b7fb-a231484277cc" Type="REG_DWORD" Data="0x00000000" I can see that key on one machine with ESET but not on an Immunet one.. Does anyone have any knowledge of the ALLOW REGKEY etc.? TIA.