title: AxAcroPDF - Vista64 Class Not Registered Error
body: <p>We have a WinForms application written in C# that uses the AxAcroPDFLib.AxAcroPDF component to load and print a PDF file. Has been working without any problems in Windows XP. I have moved my development environment to Vista 64 bit and now the application will not run (on Vista 64) unless I remove the AxAcroPDF component. I get the following error when the application runs:</p>
  
  <p>"System.Runtime.InteropServices.COMException:
  Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))." </p>
  
  <p>I have been advised on the Adobe Forums that the reason for the error is that they do not have a 64 bit version of the AxAcroPDF ActiveX control.  </p>
  
  <p>Is there some way around this problem?  For example can I convert the 32bit ActiveX control to a 64bit control myself?</p>