The PDF - reader software that often comes bundled with computer systems does NOT create PDF files; you need separate software to generate PDF files. (sciencemag.org)
No need to buy separate software, no need to by a dedicated PC tower. (itwire.com)
You need to spend some time formatting your manuscript on a word processor before uploading it, but there is no need for you to purchase separate software for that purpose. (readersfavorite.com)