Problem with PDFCreator method in Excel VBA

The system hang on the cCountOfPrintjobs method. Even
if my PDFCreator object has sent a print job, and I see this print job in the
PDFCreator Print queue, the cCountOfPrintjobs  always equal 0, it doesn’t
show the actual amount of print job in queue.

The same with cCombineAll, When I have more than one
print job in the PDF creator queue, it is not combining the print job into one.

Can anyone give me a clue on the reason why this is
not working? I have Windows 8 with Office 2007 (Latest Update) and the latest
version of PDFCreator.

Thank you!