You can press the Prnt Scrn button on your keyboard. That will capture the whole screen. Or press Alt - Prnt Scrn to capture just the active window. The screen cap will be copied to the clipboard, then open Paint or some other image program, then paste, crop if needed, and save. I use Irfan View. Small & simple. You have the option of saving the screen capture directly to file or display in the program, adjust color/add text/whatever, then save. Can also capture the entire screen or just a select area.