title: CoCreateInstance fails with 0x80040154 on ITaskBarList3
body: <p>Does anyone have any idea why CoCreateInstance would be failing on ITaskBarList3 on Windows 7 64-bit? The error code is 0x80040154, which is Class Not Registered.</p>
  
  <p>The calling code (VB6) is:</p>
  
  <pre><code>Public Const IID_ITaskbarList3 = "{EA1AFB91-9E28-4B86-90E9-9E9F8A5EEFAF}"
  Public Const CLSID_TaskbarList3 = "{EA1AFB91-9E28-4B86-90E9-9E9F8A5EEFAF}"
  
  '....
  
   Dim IID As GUID_API
   Dim CLSID As GUID_API
  
   Dim iTaskBarVB3 As ShellLib.ITaskbarList3
  
   rc = CLSIDFromString(StrPtr(CLSID_TaskbarList3), CLSID)
   rc = IIDFromString(StrPtr(IID_ITaskbarList3), IID)
   rc = CoCreateInstance(CLSID, 0, CLSCTX_SERVER, IID, iTaskBarVB3)
  </code></pre>
  
  <p>The returns from CLSIDFromString and IIDFromString are both 0 (Success). I can find the string in the registry. Since my taskbar is obviously working just fine, I know the interface is able to be called by other processes just fine. </p>
  
  <p>ITaskBarList3 is declared in a typelib compiled using mktyplib.exe. I've double checked the GUID values, and they match those in the SDK.</p>
  
  <p>Any help would be greatly appreciated.</p>