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The Windows 8 Developer Preview edition includes its own hypervisor, which allows you to create virtual machines that can run other versions of Windows. You can install virtual copies of Windows XP, Vista, or Windows 7 for backward compatibility and testing. Or you can install a virtual copy of Windows 8 to experiment without putting your main Windows 8 installation at risk.
Hyper-V is turned off by default. To enable it, enter Features in the Search box, click Settings, and then click Turn Windows features on or off from the results list. That opens the dialog box shown here.
Click to select Hyper-V and its components, and then click OK. That installs the necessary components, and you can now use the Hyper-V Manager to create a new virtual machine or import an existing one and begin working with it.