Well Every Desktop and Laptop has feature to print screen with Prnt Scrn button. But it print the whole screen. If you want capture or print only portion you want. Then you cannot do it with this button. But windows 7 has inbuilt feature which let you help take a screenshot of that portion you want. You don't need any other software to do this.
Steps How to do :-
1. Open Start Menu from the Taskbar and type "Snipping Tool" without quotes.
2. Now it i ll open . Now select how you want to capture .
3. Now Click on New and take screen shot as you want.
IF you find any difficulties feel free to comment us. If you find it helpful please share it with your friends.