For Stirling beta 2 now available, you can run Stirling in a virtual environment by using the Windows Server 2008 Hyper-V™ virtualization feature. Using the standalone Microsoft Hyper-V Server 2008 is not supported.
Installing the server or client components of Stirling within Microsoft Virtual Server is not supported. Microsoft distributes preinstalled virtual machines for evaluation use.
Refer to
http://technet.microsoft.com/en-us/library/cc441281.aspx
by Susana Guedes http://susanaguedes.spaces.live.com | http://www.linkedin.com/in/susanaguedes