I edit screen prints in WORD.

after clicking the print screen key (top right of your keyboard)

click paste in the WORD doc. Right click on the image. In your tool bar or some where on the screen you should see an editing bar with the crop tool. crop looks like 2 Xs mating at an angle.
click on it and when you hover at the appropriate plaes one the edge of the image, you will get a little |- thingie, which lets you cut away edges.