File Association - Where is it?

Windows 7 32-bit, latest ver. of PDFCreator.

We had Adobe Acrobat installed, uninstalled it and installed PDFCreator.

Following sending a document to the PDFCreator virtual printer PDFCreator tries to open the document with the default application associated with the file extension (in this case: PDF).

Well, we get an ugly message that indicates that our Acrobat license number cannot be found... PDFCreator is trying to open the PDF document with Acrobat, which is no longer installed.

What's odd is that we've set the associations for PDF to Adobe READER; when we double-click on any PDF Adobe Reader is launched and the PDF loaded into it successfully.

Any ideas why PDFCreator is trying to launch Acrobat?

TIA for any help or suggestions, gratefully received.