I have had this problem for ages and have just 'adapted' to it, but its very frustrating.
Everytime I click on a folder it opens a whole new window for me to view it, and then another window is opened when I click on another folder again.
It used to just open in the same window, but now I end up having 5 different folders open on the taskbar to get to just one photo or file.
I have tried looking around in folder options and have "Open each folder in the same window" selected, but it still opens them in a new window!
Very confusing, please help.