So the scenario is that I have an instance of Windows Server 2012 (Windows Server 8 Beta) running on VMware Workstation 8 on my laptop.

Adding Hyper V role to the server


Error : an hypervisor is already running

Browse to your VM location and open the vmx file and append at the end the following two lines

 

1
hypervisor.cpuid.v0 = "FALSE"
1
mce.enable = "TRUE"

--> Please see the rest on the blog : http://wellytonian.com/2012/05/running-hyper-v-on-windows-server-2012-from-esxi-5-vmware-workstation-8/