Snipping  is a simple screen capturing tool  for Windows 7 users
you can capture a part of the screen using this tool.

Go -> Start -> All Programs -> Accessories -> Snipping Tool

Then you will see the Snipping tool like this,

Now click on New button, then it is possible to draw a rectangle to select an area to crop the screen.

 You can select the area to crop as you need.
After that you can edit(draw on image, highlight..) the cropped image on snipping tool.

 Finally save it with suitable format. That's all enjoy.

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