how to install SQL server on Windows server 2008 (domain controller problem)

I need to install SQL server on my Windows Server 2008 virtual machine. The problem is that a warning is appearing that I shouldn't install SQL server on my domain controller. OK. So I am trying to create another domain/server. In fact I am trying to create a virtual machine inside the Windows Server so I can install SQL server on it. But I am having trouble to do so. I have tried to install Hyper-V but it did not install successfully and I think because my processor does not support for hardware assisted virtualization.

So my question is, How can I create another server to install SQL server for my Windows Server 2008 virtual machine?