Only today I had one user not being able to print stand alone pictures in JPG format. She can print any other document type and any other format. Another user started with the same issue just a week ago. They run Windows 7 Pro 64 and the printer is a networked RICOH Aficio MP C4501. They use the default Windows Photo Viewer. I heard rumors that the Photo Viewer might be corrupted and that I should run a repair install of Windows. Is this true? Should I just install another image viewer instead?