This is too weird. Using Acrobat Pro 8 from inside Word, I can make a PDF from an icon on the toolbar. That PDF goes into a shared folder on that computer and is readable from that computer. But from another computer (Win7) on the network when I try to view or copy that PDF I get an error "You need permission to perform this action. You require permission from the computer's administrator to make changes to this file." From an XP machine, the error is "Cannot copy filename: Access is denied". Every other file within that folder is accessible including other PDFs that were made externally from Word. From the creating computer, I can copy these problem PDFs to other network locations and they become accessible. There are no password or other security settings on that folder.
Using Acrobat with Word closed, I can select the same DOC file and create a PDF from it in the same place. That PDF will be accessible from the network. What's happening within Word that is making the PDF file inaccessible?