Graphics links don't work automatically

Suddenly my system has lost the ability to show charts, graphs, photos, and other graphics represented by the small, multicolored box in the upper, left-hand corner of the graphics space. The graphic can be seen by right clicking on it so I know that it is not a problem with the link. Previously, the graphics have been shown so automatically, that I now know that I have no idea what has been activating them. Is this part of Win XP Pro that has been corrupted? Or some setting or file in my Firefox browser? Or some file that was installed with the graphics card? Or does it require an auxiliary program that has gotten erased? I'm clueless and need help in restoring my system to its previous state.