Windows 7
Click the Start button 
, type winver in the search box, and then press Enter.
You should see the following:
Windows 8 and 8.1
On the Start screen, type winver, tap or click Apps, and then tap or click winver.exe.
You should see the following:
Windows 10
In the Search box to the right of the Start button, type in winver and then press Enter on your keyboard.
You should see the following:
