'Page Background' section > click 'Page Color' > click 'Fill Effects.'.Since the Header formatting option presented by others typically is not an appropriate option for many encountering this issue, and the background printing/spooling options don't work, the resolution to prevent the background image from tiling when printing to a PDF or a printer is as follows: Was personally having this issue in Word 2007 where the Print Preview displayed the background image correctly, centering and filling the entire background, yet printing to a PDF or printer results in the background image being tiled repeatedly on the entire page => finally figured it out!
