hyper-v disables vt-x for other hypervisors

Hello,

I just installed windows 8 pro on my working computer.

I work a lot with virtual machines for special os setups. Recently I used Virtualbox for those machines.

But with windows 8 pro VBox says there is not VT-X available ... (mainboard and processor support vt-x and it is enabled)

Well it was available before I switched to windows 8 pro.

I search the net and found a hint that hyper-v might be the cause. I had hyper-v installed because I am planning to migrate to hyper-v from vbox.

I uninstalled hyper-v and vt-x was available again. Question now is why does hyper-v does disable vt-x for other hypervisors or even better how can i prevent this ?

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