First: Upgrade the virtual machine hardware to vmx-09 version ( esxi 5.1)
Second: expose the Hardware virtualization to the virtual machine guest
Third: Change the VMX file and 2 ROWS:
hypervisor.cpuid.v0 = "FALSE"
mce.enable = "TRUE"
Fourth: Power on the virtual machine and add the Hyper-V role
Good luck on this one,