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I'm trying but failing to visualize what you are seeing on your screen. Are you using the Filter Gallery in Photosop CS and the window is larger than your screen? If so, can you see the little menu triangle at the lower left of the Filter Gallery window? Perhaps you can use that menu and choose 'Fit on screen'. Alternatively, how about changing the resolution of your monitor so you have more screen real estate?
The Minimum Required Resolution for Photoshop CS is 1024 X 768. If the monitor has resolution below this you are not able to see full window of filter gallery and there is also one more option in Photoshop CS which will enable only in the resolution equal to 1024X768 or higher. That is Palette Well. You can find this on the options bar at the right side. If the resolution is below the above said resolution you wont be able to use either Palette Well or Filter Gallery fully. There is no other alternative to use them with a low resolution monitor ... i suppose.