There is several free software available online that can help you make a pdf file. The one I like to use is PrimoPdf (you can download it at (http://www.primopdf.com/).
Once you downloaded the software, all you have to do to create a pdf file form your document is click “print” and choose as “PrimoPdf” as printer in the printer dialog box.
This video will show you in detail how it’s done.