The PrtScn key sends an image of the screen to the clipboard. You must then
open Paint (or any graphics program) and COPY that image to the application.
OK. I downloaded this utility and it's wonderful. When you install it, it
runs in the background. When you press the prntscrn button it captures the
screen and opens an application that allows you to print the image, save it,
select a section of the screen or select an object (window) etc.
I just downloaded the free version and I give it *****(5 stars).