Hi mschafer,
Welcome to the HP Forums! :smileyhappy:
I understand that your HP Photosmart 7520 is not printing 4x6 photos from Windows 7.
Please take a look through this guide. Print Photos Saved on Your Computer (Windows).
Otherwise, please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. Country-language selector.
Hope this helps, and have a great day! :smileyhappy: