virtualbox.org

I installed VirtualBox on my Surface Pro4 and close Hyper-V and reinstall VirtualBox. The VirtualBox still does not list the 64 OS.
Does somebody know how to solve this problem?

Please go thoroughly through the FAQ: I have a 64bit host, but can't install 64bit guests. Remember that these are just guidelines, you have to use your judgement...

I had set Local Computer Policy > Computer Configuration > Administrative Templates > System > Device Guard > Turn on Virtualization Based Security to Disabled.
But it does not work.