You have a virtual environment, and you create a 2008 template server. You need to sysprep it to ensure the system is unique.
Sysprep is located under c:\Windows\System32\sysprep\sysprep.exe on every 2008 server install.
Tick the box "Generalize", this ensures the server has a new SID. Change the shutdown options to shutdown.
When the virtual server shuts down begin cloning it.