The machine that you are taling of is a Windows Home Server ( running windows 2003 server under the wraps). Just like SBS 2003 is running windows 2003 under the wraps.
You should be able to run AC 4 on this machine. I have not tried it, but I would bet it will work.
Let me know if you need help. The good thing about the window home server is that it can backup all client machines (vista and above) everyday night.
