I have read in other forums (via google) where others have also ran into the same problem. In one case, the issue was solved by installing a version of Adobe Acrobat and then converting. I have no idea if this is the only solution as I agree with Paul's comments above in that it should work via "Save As" .pdf. Depending upon the urgency for this to occur, it may be worth exploring the installation of Adobe (there is a free download version available but, the link escapes me right now...will look for it an post if necessary).