Enabling Hardware Virtualization or Intel VT-x on Macbook Air 2013 Parallel Desktop 9

Hello,

I am trying to enable VT-x. I have check that the processor support VT-x, but I don't know if it enabled in Macbook Air 2013 or Parallel 9.
Also you can see in Windows 8 64-bit, using a software call SecurAble, it shows that the Hardware Virtualisation is disabled.

Can anyone teach me how to enable hardware virtualisation or Vt-x on Macbook Air?

Hope to hear from you soon.

Thanks,
Ren