Booklet in MS Word 2007 prob
 

I have made a booklet in MS Word 2007. When I try to print it instead of the pages printing side by side on the paper, the second page print directly over the first page on the same piece of paper. I've tried going to pdf, but it shrinks to booklet too much (and I've even put the page scaling to "none"). I'd like to do it in Word, and I'm sure it's something small. Could someone help me please?

Another interesting thing is that there is a header on the page and it prints correctly on the facing page.