Vista - Choose File

Does anyone know how to resize a Choose File box please. I add photographs
to a website and when I click the part to add a photo the Choose File Box is
quite small, I resize it my dragging the corners and enlarge it, when I go
back to add the second photo it is back to the same small size again.
Nothing I do permanently resized it, even for the duration of adding the
photos. It is most frustrating as you cannot see all the photos in the
Choose File box. In other versions of Windows the box stayed resized for
the time you were adding the photos. I would be so GRATEFUL if someone
could come up with a solution please

Margaret