LOTS OF PEOPLE are having this same problem that I describe below.
There is a long thread about this topic over on the Microsoft TechNet Forum. with no answer except some crazy wacky suggestions.
There is an older thread about this topic here on the Windows Answers Forum, and the moderator asked us to submit a newer current question on the same topic.
Here is the problem: we open a .JPG file in Windows7 Photo Viewer, and the picture opens fine and is displayed on the screen. Choose Print at the top of screen, choose print again on the drop down menu. New window opens with all the default choices for printing. Choose the button "Print" and NOTHING HAPPENS. The software just sits there.
The same picture opens and prints perfectly if we use QuickTime or Internet Explorer to print it.
Please go look at the Microsoft TechNet thread about this same topic for more information (but no solution).
Please give an answer WITH INSTRUCTIONS even for the most basic steps. Which menu to use, where to point-and-click, etc. Most of us are new to Windows7.