Issues when installing Hyper-V Platform with 8 network filters running

Hi. This isn't so much a question as a solution in case anyone else has this problem.
I tried to install Hyper-V Platform on Windows 8.1 Pro but it kept undoing changes after 93%.
I had it previously installed on the same hardware so knew there weren't any limitations there. Some forums suggested running "Dism /Online /Cleanup-Image /ScanHealth" followed by "Dism /Online /Cleanup-Image /RestoreHealth" but this
made no difference.
Eventually, I looked up a forums that suggested "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network\MaxNumFilters" had to be set if a maximum of 8 filters were in use. So I created a DWORD entry with a value
of 14 (maximum on previous Windows versions) but it still didn't work!
I checked how many networks filter were active with this powershell script:
get-itemproperty hklm:\SYSTEM\CurrentControlSet\Control\Network | format-list -property MaxNumFilters
$children = get-childitem -path hklm:\system\currentcontrolset\control\network\"{4d36e974-e325-11ce-bfc1-08002be10318}" | get-childitem | where-object {$_.PSChildName -eq "Ndi"} | get-itemproperty | where-object {$_.FilterClass} |get-itemproperty -name FilterClass
"Filter Count: " + $children.count
"Filter List: "
$children | foreach-object -process { get-itemproperty -path $_.PSParentPath } | format-list -property Description,PSPath
Still 8 were active! I then read that Windows 8.1 should scale MaxNumFilters automatically so I removed MaxNumFilters from the registry. Finally, I uninstalled my Anti-Virus (Kaspersky in my case) then tried installing Hyper-V platform again and it worked!
After that, I ran the powershell script again and it detected that 9 filters were running. It looks like a bug whereby Windows is not scaling up the MaxNumFilters properly when Hyper-V platform is installed.
This might only be an issue with Kaspersky and/or if exactly 8 filters are running but I imagine there are many more conditions under which this might occur.

Hello ZXCallum,
Thanks for your sharing.
Best regards,
Fangzhou CHEN
Fangzhou CHEN
TechNet Community Support

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