Do a search for .pdf converter, the results should yield some shareware and freeware you can download and install. Some convert to .pdf some convert from .pdf, some do both.
The adobe reader allow you to export PDF as text files, but it will lose the structure or layout of it. So use a good pdf to word converter will be a better choice, it will well preserv all the content like images, fonts, chart. And it also convert the encrypted pdf files. Try this one http://www.convertpdf.org/edit-pdf-in-word.html