From http://scottiestech.info/2009/08/08/how-to-easily-print-a-large-image-to-multiple-pages-in-windows/
How to Easily Print a Large Image to Multiple Pages in Windows
Open the image you’d like to print in Paint
Select: Print -> Page Setup (Vista and 7), or File -> Page Setup (in XP)
Under Scaling, select Fit to and change the setting to something like “2 by 2 page(s)”
Click OK
Print the image from Paint, and make sure to select “All Pages”