you can set the fontsize in the PDFCreator options->program font or under HKEY_CURRENT_USER\Software\PDFCreator\Program ProgramFont if the options aren’t usable anymore due to oversize. Or does it only hapen when printing from Word? It is a big mistery how this happened though.
I made the user local admin so I could edit the registry. ProgramFontSize was set to 28, I changed it to 9. Now it looks ok. I did not try to print from any other types of documents.