How to deactivat the progress of the green bar of Windows ( VISTA)?

How to deactivat the progress of the green bar of Windows ( VISTA)?

I use Windows VISTA. When I open the explorer Windows and when I go to a directory which contains many videos, there is in the top of the window a green bar which increases slowly. It sometimes puts one minute so that the green bar finishes its progress. And I have to wait all this time so that my files videos can display in my window (Windows Explorer)