title: Error while profiling with VS: Unable to open profiler driver
body: <p>I am running Windows 8 with UAC <em>completely disabled</em> which is possible to do by changing a <a href="http://www.eightforums.com/system-security/2434-disable-uac-completely.html" rel="noreferrer">registry setting</a> (setting it to "Never notify" no longer completely disables it in Windows 8).</p>
  
  <p>When I try to profile C# code through Visual Studio I get the following error (clicking yes doesn't resolve the problem):</p>
  
  <blockquote>
    <p>Unable to open profiler driver, would you like to upgrade credentials of [username]?</p>
  </blockquote>
  
  <p>Running <code>vsperfcmd /Admin:Driver,START</code> from the command line says:</p>
  
  <blockquote>
    <p>Error VSP1449: Unable to start VSPerfDrv100. This driver has been
    blocked from loading Try using the /Admin switch of VSPerfCmd from an
    elevated environment.</p>
  </blockquote>
  
  <p>I obviously am using an elevated environment, since with UAC completely disabled I no longer have two security tokens but only the administrator security token.</p>
  
  <p>How can I resolve this problem?</p>