1 Locate the "Print Screen" button on your keyboard . The "Print Screen" button may be labeled "Prt Sc", "Prnt Scrn", "Print Scrn", or similar. On most desktop keyboards and the keyboards of bigger laptops, the button is usually found next to the "F12" and "Scroll Lock" keys. On laptop keyboards, you may have to press the "Fn" or "Function" key to access "Print Screen". 2 To take a screenshot of the entire screen, with all windows, press "Print Screen" alone . To take a screenshot of the currently selected window, hold down the "Alt" key and press "Print Screen". 3 Open Microsoft Paint . To open Paint, open the Start menu, click on "All Programs", click on "Accessories", and finally click on "Paint". 4 Paste the screenshot . Select the "Rectangular Select tool" in Paint. Right-click on the canvas and select ...