I am trying to test Server 2008 R2 by installing it on a virtual machine running under Hyper-V on Server 2008 R1. Unfortunately, every time I try to install it from the .ISO image, I get a prompt to insert a driver disk. I have tried this on three separate Hyper-V servers with the same result on each one. Is there a driver disk I am somehow missing? According to Microsoft, running a Server 2008 R2 guest is supported ( http://www.microsoft.com/windowsserver2008/en/us/hyperv-supported-guest-os.aspx ). Has anyone else run into this problem? How did you get around it?