=> This information pertains to servers with a Supermicro mainboard and AMD server CPU

Problem:

You receive the following error message under Microsoft Windows Server 2008 R2 when running a virtual machine under the Hyper-V Hypervisor:

"The virtual machine could not be started because the hypervisor is not running"

Solution:

A Microsoft hotfix is missing. You can find him here:
http://support.microsoft.com/kb/2568088