Lately and not knowing why,my computer is having Picture Viewer in command of all my photographs.This programm may be good but I cannot see my pictures just by clicking and worst of all,some times graphics that are sent to "my imgenes" won't open when clicked.I have to use the right button to "open with.."and use ADCsee programm which is the one I want to take command of my pictures.How do I do that? Ialso would like to know what one does that suddenly the command changes.Thanks

This video will show you how to change file associations:
Video - Windows XP File Associations - How to Edit File Associations in Windows XP (http://video.about.com/windows/Windows-XP-File-Associations.htm)