title: Unable to cast COM object of type 'Microsoft.Office.Interop.PowerPoint.ApplicationClass'
body: <blockquote>
    <p><strong>Unable to cast COM object of type 'Microsoft.Office.Interop.PowerPoint.ApplicationClass' to interface type 'Microsoft.Office.Interop.PowerPoint._Application'</strong>. This operation failed because the QueryInterface call on the COM component for the interface with IID '{91493442-5A91-11CF-8700-00AA0060263B}' failed due to the following error: Library not registered. (Exception from HRESULT: 0x8002801D (TYPE_E_LIBNOTREGISTERED)).</p>
  </blockquote>
  
  <p>I am unable to  finding solution please any one help in this?</p>