Have you tried rebooting? After that, try ctrl F8 just for the sake of trying something. You can hit it again until you get the display back. I don't know if it will fix that screen size issue or not. I've never seen that happen before.
Maybe check or change the monitor in Display Settings. I'm on a Dell Inspiron E1505 with Vista. I looked at the keyboard and I don't see anything that sticks out as being a display button other than the ctrl F8.
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