Hah. Thought this sounded vaguely familiar. Turns out VirtualBox had an issue with the "new" instructions needed for Windows 8.1, too. https://blogs.oracle.com

Hah. Thought this sounded vaguely familiar. Turns out VirtualBox had an issue with the "new" instructions needed for Windows 8.1, too. https://blogs.oracle.com/fatbloke/entry/using_virtualbox_to_test_drive https://blogs.oracle.com/fatbloke/entry/using_virtualbox_to_...