While installing windows operating system in our computer, we never note it's installation date and time. But do you know, we can get to know when we installed windows in our computer easily. Sounds strange but it is really easy. Follow the trick below:

• Open command prompt (go to start menu > click run > type cmd and press enter)
• Now type systeminfo | find /i "Original Install Date" and press enter.
• That's it. You will see the installation date and time of your windows operating system. If you want to see your system information only, then you may type systeminfo in command prompt.