Go into power desk.
Go to Multi-Display Setup.
Go to "Mode Management..."
Pick the Resolution of Just one of your monitors.
Apply this and Restart
Next Load up Counterstrike and Change the Resolution in game to the same one you added under your display modes.
You may not need to do the first 5 steps as your desired resolution is probably supported out of box.
EDIT: BTW, it would be helpful, especially when asking for help, for you to put your computer specs in your signature.
_________________ System Core: | Intel Core i5-2500K + ASUS P8Z68-V + 16GB Corsair XMS3 DDR3 1333 MHz | Win7 x64 | MSI R7970 Lightning 3GB [1105/1400] | Display: | 3 x Dell Ultrasharp 3007WFP-HC @ 7680x1600 | Dell u3011 |
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