Ok...I can only say from my experience
My pictures are filed in windows based on major subject and then within that I have dates/events. With pse8 which I started with, I tagged the images with further inpformatio. Using the organizer. Then I told the organizer to add all the tags to the properties of the file. This is known as metadata. I am in the process of finding out how much of this metadata can be searched by windows 7. Will let you know what I find out if you wish.