VT Not Supported when Installing HAXM

I am trying to install fast Android emulator which uses Intel x86 emulator accelerator. I've downloaded the accelerator via SDK manager but when I tried to install it I got following error message in the beginning of the installation:

I know that my CPU (i7-3520M) supports VT-X virtualization so I went to BIOS to make sure that it is enabled:

As you can see, the feature is enabled in BIOS. I've found 'securable.exe' utility on the internet and when I launch it the following window is shown:

Any thoughts or recommendations? I have Lenovo Z580 Laptop with Intel Core i7 and I know for sure it should support such a basic virtualization functionality.

OS is Windows 8 Pro, I also have Hyper-V enabled, I use this machine for Windows Phone 8 development.

--- edit ---

It turns out that VT-x starts working when you turn off the Hyper-V! It is very annoying because I cannot use Android and WP emulators at the same time. Does anyone know how to fix it?

So the only solution I've found to make it work is to completely disable Hyper-V in Control Panel -> Programs and Features -> Turn Features On or Off.

If anyone knows how to enable VT-x without disabling Hyper-V please answer this question...