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Documenting Problems That Were Difficult To Find The Answer To

VirtualBox VT-x Disabled In BIOS

So you add a virtual machine into Oracle VirtualBox and get the following message:

VT-x is disabled in the BIOS

VT-x is disabled in the BIOS

The message reads:

Failed to open a session for the virtual machine.

VT-x is disabled in the BIOS.
(VERR_VMX_MSR_VMXON_DISABLED).

> Details

Solution

I found the solution in this thread.

From the command line run:

c:\Program Files\Oracle\VirtualBox\VBoxManage.exe” modifyvm <VMname> –longmode off

If this does not work try also running what is suggested in this forum post:

c:\Program Files\Oracle\VirtualBox\VBoxManage.exe” modifyvm <VMname> –hwvirtex off

2 responses to “VirtualBox VT-x Disabled In BIOS

  1. jorge May 29, 2014 at 12:33 am

    I had to change '-longmode' to '--longmode' then it worked.

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