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How to get Windows Virtual Server 2005 R2 SP1 running on Windows Server 2008

I have a Windows 2008 server and I just installed Virtual Server 2005 R2 SP1. When I went open the Virtual Server Website Administrator, a File Download - Security Warning box open asking me if I have to save or search for a program that would open it. Did I miss a step?
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Is that a Windows Server 2008 *R2* version... .or just the plain Windows Server 2008?
Since I was running Windows 2008 Server on 64bit hardware, I installed Hyper-V and then installed Windows 2008 Server.