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

Solución 1.

In Virtual Box “Settings” > System Settings > Processor > Enable the PAE/NX option.

Solución 2.

Apagar la computadora
Prenderla y acceder al BIOS
Habilitar Virtualization Technology (VTx) and Virtualization Technology Directed I/O (VTd)

Solución 3

En Virtual Box Configuracion > Sistema > Memoria base : Reducir la memoria a menos de 3GB

Fuente: http://stackoverflow.com/questions/33304393/vt-x-is-disabled-in-the-bios-for-both-all-cpu-modes-verr-vmx-msr-all-vmx-disabl