Hyper-V on the Windows client is a feature that we were all waiting for. By default this feature is not enabled, so you will need to do the following steps in order to activate Hyper-V on Windows 8 Client.
Before you start make sure that your machines supports Hardware Server Virtualization and that it has has been enabled in the BIOS
On the Metro screen enter “Programs” and search for it under “Settings”
Select “Programs and features” and you will see the well known screen where you can add features to Windows 8 Customer Preview
Select the Hyper- V role as shown in the screenshot below, in order to install Hyper-V on Windows 8
After successful installation the machine will need a reboot.
After the reboot, you will see Hyper-V Manager and Hyper-V Connection Manager on the Metro Interface
Using Hyper-V Manager to configure Virtual Machines
When you are planning to host Virtual machines which has been created on Windows 8 later on Windows 2008 R2 Server make sure that you following Knowledge Base article http://support.microsoft.com/kb/2526776 in order to avoid Blue Screens