Everyone is familiar with the way windows logs off and/or locks.

a box comes up that either says "press ctrl-alt-del- to begin" or , if the station was locked, it
says " this computer has been locked (blah, blah, blah).

However, a few weeks ago, my computer stopped displaying these boxes. when i log off or lock my computer, a box with my username in its field and any empty password field comes up.

anyone have any clues as to how i can get the old look back?