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Next, move down to storage and go to your virtual hard drive (.vdi) under the SATA controller and click host I/O cache. While there, your Windows 8 Preview .ISO file should have been mounted already/ If it hasn't been yet , mount with IDE and make sure you're using IDE with the ICH6 IDE controller.
After you've completed these steps, you'll return to the VirtualBox main display. Here, click on your new virtual machine.
You'll now be at the First Run Wizard. From here on out, you'll be installing Windows just as if you were on a new PC using a DVD.