MS HyperV and Oracle VirtualBox.

Hi all.

I know this problem is -  problem due to the fact of incompatibility between MS HyperV and Oracle VirtualBox on the one host. However, today I can propose for you 3 steps for resolving it with VirtualBox:

1) to get your VMs working, you will need to go into the VM settings, choose the System section, go into the Acceleration tab, and select "Hyper-V" as the Paravirtualization Interface. 

2) you may also have to disable the "Enable I/O APIC" checkbox on the Motherboard tab. 

3) if you found some guest OS crash with it checked, but if it works for you, then leave it as is. Then,  you need to add an obscure setting to the .vbox file associated with your VM image:

VBoxManage setextradata "<VM Name>" "VBoxInternal/NEM/UseRing0Runloop" 0

Good luck!