If you are in Vista you need the language packs and in XP2 and up you need to install a 230 megs file in regional and then add Chinese and Japanese text to Office Word then you could save it as PDF with the free download below.

http://www.microsoft.com/downloads/details.aspx?FamilyID=4d951911-3e7e-4ae6-b059-a2e79ed87041&displaylang=en