Hi:
See the service manual at the link below, chapter 3, page 18 for the location of the enable VT setting...
http://h10032.www1.hp.com/ctg/Manual/c04034127
System Security
(these options are
hardware dependent)
SVM CPU Virtualization (enable/disable). Controls the virtualization features of the processor.
Changing this setting requires turning the computer off and then back on. Default is disabled.
Virtualization Technology (VTx) (enable/disable) - Controls the virtualization features of the
processor. Changing this setting requires turning the computer off and then back on. Default is
disabled.