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Sometimes you can get “VT-x is not available. (VERR_VMX_NO_VMX)” error if you are trying to start x64 bit virtual machine in VirtualBox.
virtualbox-vt-x-is-not-available-error

Failed to open a session for the virtual machine Windows 10 TP.

VT-x is not available. (VERR_VMX_NO_VMX).

Result Code: E_FAIL (0x80004005)
Component: Console
Interface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}

 

 

There are three most common reasons for this error:

  • Your CPU doesn’t support VT-x or AMD-V virtualization
  • VT-x or AMD-V is not enabled in BIOS (UEFI)
  • You have Hyper-V virtualization enabled in Windows

You can fix first one only by replacing CPU with a new one, but it is easy to fix second and third reasons.

Solution 1: Enable VT-x in BIOS

  • Restart your computer
  • Load into BIOS (press Del, F2, Esc key. Depends on motherboard)
  • Find Virtualization setting and enabled it. It might look different in you system, but here are some examples:

enable-vt-x-in-bios

Solution 2: Disable Hyper-V virtualization

  • Run cmd.exe as Administrator
  • Execute:
    1
    dism.exe /Online /Disable-Feature:Microsoft-Hyper-V
  • Reboot computer

Another way:

  • Open Control Panel
  • Go to Program section -> Turn Windows features on or off
  • Disable Hyper-V

disable-hyper-v

 

 

 

 

 

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