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Note: The Screencast about the free Microsoft Hyper-V Server 2008 is available here
Windows Server Hyper-V role is only available for x64 editions of Windows Server 2008. If you are running currently a Beta, RC0 or RC1 version of Hyper-V check our screencast about identifying the current version of Hyper-V and upgrading it to RTM version.
Your x64-based processor must support hardware-assisted virtualization, and hardware data execution protection. In addition, hardware-assisted virtualization should be supported by your motherboard and enabled in the BIOS.
In the following Screencast, you will see how to install Windows Server 2008 Hyper-V.