Please clarify something for me.
You said that the extra pages happen when you go to print. Is that the only time you notice them? That is, when you are in Word, using the "Print Layout View" do you see the extra pages then?
If so, then just turn on the invisible characters (where you can see the paragraph ends, and the breaks, etc.). Then, see what it is causing the extra pages. Find out what's causing it and fix that.
If, however, the extra blank pages are not in Word, but only appear when you print, then something is odd with either your print driver or your printer. Some printers can be set to generate an extra page at the end of a job to be use as a "spacer" or "slip sheet" between print jobs.