I thought nested VM's were a feature of VMWare Fusion for MAC. If so why doesn't this work? I enabled the Intel VT setting, it just keeps complaining that a hypervisor is already running. I'm running this on a MacBook Pro 13" Retina. I'd use BootCamp but they haven't updated it for this macbook yet. So fustrating.
I found the answer here
http://communities.vmware.com/message/2139405#2139405
I had to change the OS type to Hyper-V (unsupported)
Ah good, glad you got this working. I think the documentation is at http://pubs.vmware.com/fusion-5/topic/com.vmware.fusion.help.doc/GUID-38178690-1234-4843-B135-4063F9... but it's mentioned in that other thread.