Sorry for the self advertising, but here is a simple way to take screenshots. First, select the window that you want to take the screenshot of, the press alt+print screen. Then open up the program here http://neofriends.net/downloads.php?d=92. Press the save button, and then you are done
Another way to do it is, just hit Print Scrn. Button and then that acts as a copy button. Then open "paint" and then paste it into paint. From there you can cut out the part of the screen you want to keep.