The way i was taught to take screenshot, was to press the 'print
screen' key on your keyboard. And then go to Paint, and just paste.
( ctrl + v or through the toolbar "Edit" ) . And then save it into
any picture format, and there's your screenshot. 
At 04 May 2004, 0350 hours, croco has 770 post to go.
Congrats~
edit: remove smiley when using
brackets