Image (Picture) Viewers
FastStone Image Viewer is an image browser, viewer, converter and editor with an easy to use interface and a nice array of features that include resizing, renaming, cropping, color adjustments, watermarks and more.
Irfanview - A Picture Viewer program, views pictures in any format. I use it some of the time to view my pictures. Download the file and double click on the file after its downloaded. (Remember to see the folder where it is downloaded).
Also download Irfanview's plugins