Hello I've already post my problem in the French Help section:
http://www.pdfforge.fr/forum/help-french/6637-bug-dimpression-caracteres-codes-illisible
I will summarize this bug I've found on PDF Creator.
When I have created a PDF with this software I'm forced to keep Adobe Reader open when I'm printing the document, otherwise characters will be encoded, unreadable! It does not happen when I create one with Adobe Acrobat. Any idea?