Re: 64 bits machines in ESXi running in Vmware Workstation

When running ESXi under Workstation, the messages about the 'host' refer to the virtual machine running ESXi.  To enable virtualized VT-x, go to VM->Settings for the ESXi VM.  On the right hand pane of the processors tab, select "Virtualize VT-x/EPT or AMD-V/RVI."