Updated: Jun 7
If you are a microsoft windows 7/8/8.1/10 user then you can very easily and instantly check whether the windows version you are using is genuine or not by launching the control panel & heading towards update & security/ system & security option. For you it's merely a piece of cake to find out the truth. Just press the start button & type settings and open the application. Now go to Update & Security as given in the below image.
On the left sidebar press the Activation tab and on the right-hand side you will see the message displaying the information about your windows activated by a product key or a digital license. Refer the below image for your doubts.
Now here is the real deal !!
Go to desktop properties & use command prompt to know whether the machine you are using is permanently activated which will be genuine/original in nature or partially activated which will determine the windows is on trial version using a partial product activation key.