How-to run nested Hyper-V 2012 Server on latest version of ESXi 5.1. If you want to test the latest Microsoft Hyper-V running as a VM on ESXi 5.1 free version, you might run into a following error: “Hyper-V cannot be installed: A hypervisor is already running.” when trying to install the Hyper-V role. Just follow this How […]