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#11
Then you have to set the resolution for the game to the same resolution your desktop is at. However it will still have a bar at the top of the window. Newer source engine games like Team Fortress 2 and Left4Dead allow you to run in a borderless window mode but that option is not available in counter strike. If you want to try it with TF2 or L4D right click on the game in your Steam game list and go to properties and then choose "set launch options..." in the launch options add in this "-window -noborder" without the quotes.