You don't need a screen capture utility to capture NT screen shots. To grab an image of the entire screen, press ctrl-print screen, then paste the captured image into Paint or your favorite image editor using ctrl-v paste keyboard command. To capture the current screen, use alt-print screen
I have used Hyperonics' HyperSnap to do screen captures to prepare tutorials or training materials. It really is a screen capture work-horse. See HyperSnap.