Last Updated: February 25, 2016
· ihcsim

VT-X Not Available Errors With Oracle VirtualBox

To help streamline the setup process of new hires' local development environment, and ensure a thorough "clean up" of the development environment of team members leaving the team, we have started to create VMs for our dev and test environments. Oracle VirtualBox (v 4.2.6) was chosen over VMPlayer because, among other factors and features, primarily, Oracle VirtualBox is free for commercial use, and it provides snapshot and rollback features out-of-the-box.

If you encountered the infamous "VT-X Not Available (VERRVMXNOVMX)" error while attempting to run 64-bit guest OS in VirtualBox, try these two solutions:

  1. Ensure support for hardware virtualization is enabled in your BIOS. This solves almost all the cases on our team.
  2. If your BIOS doesn't support hardware virtualization, open up your Machine Definition file (XML) in the folder where your guest OS image file is, and disabled the hardware virtualization extension setting by changing:

this line

<HardwareVirtEx enabled="true"/>


<HardwareVirtEx enabled="false"/>

2 Responses
Add your response

Can I ask you to explain how I can open my Machine Definition file ?

Thanks in advance:)!

over 1 year ago ·

It should appear as a .vbox file in the folder where you saved your VM. If I have a VM named sandbox, the .vmdk, .vbox and log files are saved under C:\Users\me\VirtualBox VMs\sandbox. The file location might be different for you though.

Hope this helps.

over 1 year ago ·