There is a really handy way of cropping pictures when you're pasting into a Word document - using the crop tool (this is on the picture toolbar).
so, you press printscreen when viewing the image you want to copy.
Switch to word, press ctrl-V
<you'll now have a screenshot in your word document>
Select the crop button from the picture toolbar
<If the picture toolbar is not open, go to View, Toolbars, Picture>
Use the little handles around the picture to remove the bits you dont want.
Easy peasy, without having to go into paint or anything. Version of Word I'm using is Word 2002.