Check out Zamzar. They offer free online file conversion. Not only can you convert your word doc to pdf, you can convert your pdf to a word doc, an excel spreadsheet, or an image (jpeg, etc).
Very easy to use. You enter your file to be converted, enter the form you want it to converted to, enter your email address and VOILA!, they email you the converted file.
If you have any technical problems with converting files, or other things, check out Online Tech Tips. This is a good place for ironing out bugs for those of us non-techie people.