How to Install the Windows 8 Developer Preview in VirtualBox
If you want to run Windows 8 inside of Windows 7 so that you can give the Windows 8 Developer Preview a try, take a look at this guide on how to run Windows 8 inside of VirtualBox. This will allow you to run Windows 8 within a virtual machine.
If you need to download Virtual box, download it here.
Download Windows 8 at the Win 8 Dev site.