How can you take screenshots from Crysis

If you don't have a program like fraps, you can press "print scrn" (usually located next to scroll lock). After pressing print screen, you'll need to either close the game or press alt + tab to get to your desktop. Open paint, then click edit, and paste the image. If you need to take more than 1 snapshot per game, it's best to get your hands on a program like fraps, just so you won't need to close your game.
For Crysis, you can also open up the Crytek Sandbox 2 provided with the game. It is, in fact, crytek's level editor. You can then open up any level you like from the game or create your own. To take nice, clean, high quality screenshots, you can use the console commands while in Sandbox 2. First type "r_displayinfo 0" to get rid of the information in the top right corner of the screen. Then type "e_screenshot 1" to take a nice, high-resolution and anti-aliased screenshot. Screenshots taken this way are saved to "C:\Program Files\Electronic Arts\Crytek\Crysis\Game\Screenshots\HiRes". Double click on the console to get a list of all available commands.