Do a Print Screen, then open your graphics program and paste it. (Programs differ on how you do this, Paint you just select Paste and it will automatically stretch the current canvas to fit, Picture Publisher you select Paste to New Image, Photoshop you have to create a canvas big enough to hold the screen shot then paste, GIMP you have to create a new canvas of any size, then you select Paste From Clipboard and it will automatically stretch the canvas, XnView just select Import Clipboard, and Illustrator is just weird.) Then crop and save the file (Most programs this is fairly easy, though Paint makes you save it as a BMP first, then you can open it and save as a different format.)