Your host system is a 圆4 version of Windows 8.1.

After that I was able to install a 圆4 version of a operating system on a virtual machine. Then, I cleared a box next to Hyper-V and restarted computer. I pressed Win+S and typed Turn windows feature on or off. It seems to me that they are installed by default with the operating system. However, I checked and I discovered that Hyper-V features were enabled on my computer. It was strange because I've never installed Hyper-V.

I needed a new VM quickly so at that point I installed a x86 version of Windows.Ī few days later my colleague Przemek suggested that the problem may be in the conflict between Hyper-V and VirtualBox and that I should disable Hyper-V. I searched Internet for the answer but everyone were recommended to verify BIOS configuration what I've already done. I checked BIOS settings and it seemed ok.

Well, it was actually good because I couldn't use a64 bit virtual machines anyway ) But, I still didn't know why it happened. Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer.Īfter some time I noticed that VirtualBox stopped showing 64 bit versions in the Version list. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot. VT-x/AMD-V hardware acceleration has been enabled, but is not operational. To my surprise VirtualBox reported the following error:

Everything was ok up to the moment when I wanted to install a 圆4 version of an operating system on a fresh virtual machine. I needed a virtualization software so I decided to use a free Oracle VM Virtual Box. In my day to day work I use a 64 bit version of Windows 8.1 Pro N.

How to use virtualbox 64 bit