This trick shows you how to setup any folder to display its contents as a photo folder. In many case, you save your images/photos in a folder different then "My Pictures" (under "My Document"). Since this folder you choose is just like any other normal folders, its contents displayed as a listing of files. You can temporary change it by just right-click and select "View" >> "Thumbnails". But if you want to change the folder so that every time you come back, the folder itself, as well as all its sub-folders, display the contents as photo thumbnails
Right-click on the folder you choose and select "Properties"
Select "Customize" Tab. Then under "Use this folder type as a template" , select "Pictures (best for many files)"
Check on "Also apply this template to all sub-folders" to apply the setting to sub-folders as well.
Click OK to Exit.