Windows 8 Preview vcpu-0:NOT_IMPLEMENTED! error in your Hypervisor!
Avoid the vcpu-0:NOT_IMPLEMENTED! error in your Hypervisor, and use the following:-
VMware Workstation 8.0 Download (trial)
http://downloads.vmware.com/d/info/desktop_end_user_computing/vmware_workstation/8_0
Oracle Virtualbox 4.0
http://www.virtualbox.org/
Microsoft Hyper-V Server 2008 R2 with Service Pack 1 (SP1)
http://technet.microsoft.com/en-us/evalcenter/dd776191.aspx