virtualbox - VT-x is disabled in the BIOS for both all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)

Question

Downloaded Xamarin Android Player and with >>next>> progress installed Virtual Box.

When I tried to start an emulator I got

Failed to initialized device (name Of the emulator)
VboxManager Commendt Failed

and the detail of the error in Oracle Vm Virtualbox is

VT-x is disabled in the BIOS for both all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)

How can I fix this?

I have found the solution of my problem, put some images to help others, thanks go here

Answer 1

It is a RAM related issue. The documentation is self explanatory:

You are trying to allocate >3GB of RAM to the VM. This requires: (a) a 64 bit host system; and (b) true hardware pass-through ie VT-x.

Fast solution

Allocate less than 3GB for the virtual machine.

Complete solution

1. Make sure your system is 64 bit.
2. Enable virtualisation in your host machine. You can find how to do it here or there are many other resources available on Google.