SCREEN, saver????? BLANK<BLACK, SCREEN!!!!!?

I have WINDOWS VISTA, and my monitor screen goes black after 20 min. the sound stays on, but I want my aol, and messenger to show and stay on longer.
I tried to fix this, but it didn't work, it still goes blank, and black.
anyone have any more idea as to what and how i can do this?
Update: qcyboy, i did that, and it still goes off!
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