title: Virtualbox “Callee RC: REGDB_E_CLASSNOTREG” (0x80040154)?
body: <p>I was getting the Virtualbox problem </p>
  
  <blockquote>
    <p>Callee RC: REGDB_E_CLASSNOTREG” (0x80040154)</p>
  </blockquote>
  
  <p>all of a sudden. Problem started on VirtualBox 4.3 (I think). I upgraded to version 5 hoping to fix it but had no luck at that point.</p>