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Hi Nukeproof, welcome to the Ten Forums.
First thing to check is that the Hyper-V Extensible Virtual Switch is enabled in your NIC's Properties:If it is totally missing click the Install button and install, it, you'll find it under Protocol:Install if needed, enable it and reboot and try Virtual Switch Manager again.
Kari
Best answer after hunting the Windows 10 upgrade destroyer of Hyper-V settings. Many Thanks.
That leads to this issue though:
Can't enable Hyper-V Extensible Virtual Switch in Networking Solved - Windows 10 Forums
That states that I need to create a virtual switch first, so which comes first?