Follow these steps so that you can have a trouble free running version of Windows 8 Developer Preview:

Configuring Oracle VirtualBox for Windows 8 - 93Configuring Oracle VirtualBox for Windows 8 - 40Configuring Oracle VirtualBox for Windows 8 - 66Configuring Oracle VirtualBox for Windows 8 - 78Configuring Oracle VirtualBox for Windows 8 - 68Configuring Oracle VirtualBox for Windows 8 - 64Configuring Oracle VirtualBox for Windows 8 - 57