VirtualBox is free and open source software that lets you run various computer operating systems. Windows 8 developer preview installer is

currently available for public download from the official Microsoft Windows website. There are several virtual machine applications available for you to try Windows 8 installation

1. Download and install VirtualBox on your computer
2. Click the New button in VirtualBox to begin installing Windows 8
3. Name your new virtual machine Windows 8 or whatever you prefer to call it
4. Under OS Type, be sure you choose Microsoft Windows and then Other Windows for the version
5. Next for base memory, choose 2000 MB or more
6. Follow the rest of the menu prompts until you get to the Virtual Disk Location and Size menu
7. Make sure that your virtual disk is at least 20GB
8. Before starting your new virtual machine, click the Settings button and change the video memory to 128 MB
9. Click the Start button to begin installing Windows 8 into your virtual machine
10. You’ll need to give the path where to find the Windows 8 ISO file you downloaded earlier
11. Accept the License terms and click Next. The installation will start in few seconds
12. After the successful installation, you should now see the Windows 8 Metro UI start screen

Make sure your processor supports Virtualization Technology and is enabled. Windows 8 will not work if your processor does not support Virtualization Technology