With version 5.5 of ESXi , the traditional vCenter tool does not allow for the full management of a VM (version 10 VM) which brings all the new upgrades to the VM.

You need to use the licensed vSphere Web Client to fully manage the VMs. vSphere Web Client only has a 60 day free period and for a home user, this kind of breaks the whole free ESXi server sandbox…

http://www.tinkertry.com/best-parts-of-vmwares-esxi-5-5-free-hypervisor-rely-on-vcenter-which-isnt-free-uh-oh/