WORD TO PDF
If you're using Microsoft Office Word 2007 or higher, you can convert you word document into PDF from MS Word itself. When you save your file in MS Word, simply click Save As or just click Save and a diolog box will appear. The first section is the file name and below that is the file type. Click the dorp down menu and you will see that you can save your file in many other format and one of it is in PDF form. If you do not have PDF shown, yI think you have to install a MS Word plugin to enable you to save in PDF.
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PDF TO WORD
For this, I use the online converter available at http://www.pdfonline.com/pdf-to-word-converter/. I haven't been able to find an offline converter that is not a free trial or a demo. So, I simply use the online converter.
*NOTE: This converter will only convert PDF nicely to Word doc if the original source was from a MS Word. If not, it will still be converted to MS Word, but it may not be as you expected. But it's worth a try though!
CutePDF is a free software you can download here. The use of this is simply to save paper or make your printing easier. For example, if you want to print a webpage, you can print it via CutePDF (which will actually save the document in PDF before you can print it). This will be much easier. Or, if you just want to save the document in PDF without printing it, you can also do that.
Well, happy trying and using the free stuff available for all of us! ENJOY AND HAVE A NICE DAY!