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Windows 7 doesn’t boot after installing on Hyper-V

Thanks to my fresh windows 10 install, I had to re-install Hyper-V. No real issues... made a new machine and booted a Win7 ISO. All well... installed quick... reboot just gave me a black screen with a flashing cursor.

Googling came up with this link... Lots of rubbish replies... but there was another one of those gems. Those one-liners that save the world.

Boot your installation media and go to command prompt via recovery, it said. Just type the following, it said:

bootsect.exe /nt60 all /force

And, well, shit... it worked perfectly.