The thing to remember is that something projected during a presentation (PowerPoint) should have less material than a document meant for printing and reading (Word).

Take the salient points, list them as bullet points in PowerPoint, and leave the rich explanations in the Word document, You can use the Word document as a handout. If there are certain graphics or charts that are critical to the presentation, include those by all means. Put them on PowerPoint slides.

If, for some reason, you need to refer to an image of an entire page, something like, "As you can see here on page 43 of the Manual..." consider scanning the needed page and inserting a jpg image. (it will be too small to read onscreen anyway)

To put a Word document onscreen and make it readable, you would only be able to put about ¼ to ⅓ of a page of Word to each PowerPoint slide or the text will be too small to be read. If you just have to have Word, consider opening the document in Word and projecting that instead of using PowerPoint at all.