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Microsoft release : hyper-V Server & Windows Server 2008 Hyper-V
Hyper-V server it's afree virtualization layer ,you can download it from microsoft site for free and burned it on DVD and repoot the server from this DVD , does not support any GUI graphics, but any Virtual Machine was installed on the Hyper-V Server it must have license.
Windows Server 2008 Hyper-V :its the windows Server but its support Hyper-v in his Roles you can add it , there are two copies of the windows "Windows server Core Installation & Windows Server Fully Installation ",but that support in the standerd , Enterprise and Datacenter Editions ,when you install Enterprise Edition you get 4 VM for free , Datacenter Unlimited
Hyper-V its available only on 46X ,does not support in 86X
The hardware must be assist the virtualization technology "Processor"thanks