How To Capture A Screenshot of your Windows Desktop or Any game

Hello Guys Now I am gonna tell you how you can capture your scrren shot by simple methods 
first press PrintScreen/SysRQ as given below

After this open your Ms Paint By Clicking Start >all Programs.Accessories>Paint As Shown In Image

after opening paint use CTRL + V to paste the captured image

like this

now you will see your captured image save the image using jpg format and now you can use it anywhere