Microsoft has issued a fix:
Hyper-V breaks after installing the Jan 2022 Windows Update on Windows 8.1 (KB5009624)
Today is Jan 11th, 2022. After I applied the monthly patch on my Windows 8.1 machine, the local VMs no longer work. If I uninstall the patch (KB5009624), the VMs started to work again. Please help.
The error is "virtual machine could not be started because hypervisor is not running".
Windows for home | Previous Windows versions | Devices and drivers
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Anonymous
2022-01-18T04:27:32+00:00
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Anonymous
2022-01-12T10:09:20+00:00 [Solved] All Hyper-V VM are Saved State. An error occurs when trying to change the state of a virtual machine