A user is unable to view jpeg files using picture & fax viewer. I checked the file types and it is listed as the default program. However, when a jpeg is double clicked, nothing happens. There are no error messages or dialog boxes, just no response. Other programs work fine and the Sophos anti-virus is up to date and running. The pc is running xp sp2 with all critical updates. I read elsewhere here that picture and fax viewer isn't a stand alone program. Any ideas?