How can I full screen a game on VGA -> Can I full screen it with settings?

Hi, I would like to know on how to full screen a game? I play Specialforce/Soldierfront and Crossfire. When I go to the game its not full screen.. Theres a blank/black space on the left and right.. but in the bottom and the top its full screen. Can you teach me on how to full screen on VGA? thanks..Because I can't use DVI and Nvidia Scaling it.. I will stick to the VGA.. Can anyone help me? Please help me.
 
Resolution/aspect ratio

Sounds to me that ether you need to change the resolution in the game or your aspect ratio to match your monitors.
 
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