Adobe Acrobat Reader can only open PDF files, but you cannot make PDF files using it. And Adobe Writer professional costs a lot of money. So, here is a list of free options to make PDF files from Word .doc documents or any file which can be printed ( there is a software which acts like a printer and makes pdf files instead of printing )

If you want to just quickly convert a Microsoft Word DOC file to a PDF, then the easiest would be to use an online free Word to PDF conversion facility. Here is a bunch of good sites which convert WOrd files to Adobe Acrobat PDF files. (PDF might be required to some DTP printers, many university projects, etc)

Doc2PDF ( http://www.doc2pdf.net/converter/ )

Good site, Has the option to browse for the file, upload and convert. This service enables you to convert Microsoft (R) Word documents (.doc) into Adobe (R) Portable Document Format (.pdf) documents.
You can also convert Powerpoint and Excel files to PDF. Powerpoint files can also be converted to Flash. This service is free.

PDFonline Doc2Pdf ( https://www.pdfonline.com/convert_pdf.asp )

Similar to the previous one, but this dude has https which means a secure connection. So, if you ware converting some plans for a top secret nuclear warhead and don’t want it to fall into enemy hands, or if you just like all the security, use this site.

You need a working email address so that the converted file can be emailed to you. It is done quickly, the email comes with the PDF.

Fast PDF ( http://www.fastpdf.com/ )

Just upload the fiel, give your email address, and its ready. Fast PDF is a web-based service that lets you convert Microsoft Word documents to PDF! The PDF format makes it easy to share documents with others and ensures that they will look the way you intended. Using the free Adobe Acrobat Reader others can access your document regardless of their exact hardware or software.

Software download for MS Word to Adobe PDF (doc to pdf) 

Free software

Absolutely free software to convert Word files to PDF files

Primo PDF ( http://www.primopdf.com/ )

Primo PDF is a good software which is free too, to convert MS Word Files (.doc or .docx) to Adobe Acrobat Portable Document Format (.pdf)

Download Primo PDF free version now

Trial software (30 times evaluation version) http://www.pdf-convert.com/doc2pdf/index.htm 

Not free, but if you want to convert less than 30 Word files to PDF, this is a good “free” choice.

Free with Watermark ( http://www.word-to-pdf.com/  )

Demo version available, but puts a watermark on the page.

PDF conversion APIs http://www.pdfonline.com/ 

Absolutely free software to convert Word files to PDF files

Primo PDF ( http://www.primopdf.com/ )

Primo PDF is a good software which is free too, to convert MS Word Files (.doc or .docx) to Adobe Acrobat Portable Document Format (.pdf)

Download Primo PDF free version now