"You’re going to find this hard to believe, but that built-in Windows app that will split-print an image for you is none other than Microsoft’s much-maligned Paint application!!"
1. Open the image you’d like to print in Paint
2. Select: Print -> Page Setup (Vista and 7), or File -> Page Setup (in XP)
3. Under Scaling, select Fit to and change the setting to something like “2 by 2 page(s)”
4. Click OK
5. Print the image from Paint, and make sure to select “All Pages”