title: Vagrant Errors after Windows 8.1 update
body: <p>After a recent update of my OS from Windows 8 to Windows 8.1 my vagrant setup has stopped working.</p>
  
  <p>I try running vagrant up on boxes and I get the following:</p>
  
  <pre><code>$ vagrant up
  Bringing machine 'default' up with 'virtualbox' provider...
  [default] Booting VM...
  [default] Waiting for machine to boot. This may take a few minutes...
  
  The guest machine entered an invalid state while waiting for it to boot Valid states are   'starting, running'. The machine is in the 'poweroff' state. Please verify everything is configured properly and try again.
  </code></pre>
  
  <p>I've tried updating vagrant. I've updated VirtualBox to 4.3. I've tried specifically setting VirtualBox to run as Administrator and in compatibility mode for Windows 8. That didn't work. Also tried compatibility mode for Windows 7. No dice.</p>
  
  <p>Anyone else having these problems? Windows 8.1 is to new to find reports of this through Google searching. hopefully someone here can help out.</p>