PDF Creator keeps setting itself as the default printer after windows 7 reboot

Hi I have installed PDF Creator Version 1.7.1 to about 10 computers, all
windows 7 32bit. Some of these computers  upon reboot keeps reverting
the default printer to PDF Creator even though the default printer was set to another printer.

I have tried uninstalling the PDF Creator and reinstalling which does not solve the problem.

is there anyway of fixing this default printer issue.

many thanks


the question is, why does PDFCreator get set as default in the first place, it normally doesn´t do that. Are ther other physical printers present, or only virtual printers?