dear SCE37
your problem isn't how to convert to pdf?, but how to get the professional version?
about how to convert from .doc to pdf, you have more than one way,but the best method to convert to pdf, is from microsoft word itself!, after installing the acrobat prof. a new icon will be appeared in the word tool bar, just click on it in order to convert the current document to pdf,
another way to create the pdf is to open the acrobat prof. then select create a new pdf from a file, select your file, done!
about how to get the professional version, you also have more than one choice,
you can purchase it from
www.acrobat.com and this is the only legal way,

or to download it by any p2p program, and this is the illegal way