You could use the standard windows functionality using the Shift+PrtSc keys to capture your screen.and than start pasting and cutting away in you Graphics Program..
But what if there was an easy way to just take that part of the screen you want?
Choose and Capture your own selections
There is a much easier way to just select the part of the screen you want, save it in a .jpg or other file format and save it with the name you provide.
A program that just needs you to hit the "PrtSc" key to show a different mouse cursor and lets you select the part of the screen you need to capture.
It then shows you what you selected part of the scree and asks you where to save the image and how you want to name the file.
And you want if for Free….
Here it is….
Gadwin Printscreen download it via the page and install the program.
Then Run it and set you preferences accordingly ot your needs.
My favorites settings are slightly different form the one in the screen.
Configuration for Optimal use
Preferences
You might want to have the program running in the background so you can use it right away, so you have to set the option "Run at Windows startup".
Disable the Splah, you don't need a reminder that its running…
Source
In the Source settings select the "Rectangler Area" option
As an option you might want to have the Mouse Cursor show in the screen to point to a special section, but if you don't want that, disable it here.
I always leave it on, and move the mouse out of the capture section of the scree.
Destination
This is where you set the standard location for you Screenshot images.
And where you can set some options on where the capture should be send, like to the Clipboard, to a Printer, to E-mail and/or to File…
If you need to take a lot of screenshots after another, you might use the automatic nummer assingment option.
Image
The only option you should use is the File type.. please change this from BMP to JPG, otherwise you have very large files, and you don't want that..
Why take screenshots?
Most of the time you can use screenshots to write show the images in articles you write, for a report or even a website 
But you can now easily take a snapshot of that erro you get and send it to you helpdesk.
You can really save a lot of time with this tool if you are writing a manual for a webtsite maintenance handbook, or a software program.
Well, I guess you have some idea's of you own on how you want to use it.
So go ahead and Download Gadwin Printscreen Utility
