Check your System Window original install date

How to check your original window install date..
its easy
follow step by step

1. Open RUN by pressing  "window button + R"
window button?
see

Then open RUN like this

2. Type CMD in RUN press Enter button
pop up a new windo like this

3. Then type systeminfo press Enter button
then you see the system info after few second

4.Done

NOTE: If you have any problem tell me in comment box

THANKS