Lenovo G50 windows 8.1 not activated?

Lenovo G50 windows 8.1 not activated?
Added (1). edededed
Added (2). I bought a new lenovo g50 laptop at
http://www.amazon.com/Lenovo-15-6-Inch-Laptop-80E501B2US-Black/dp/B00SB4AEAS/ref=sr_1_3?s=electronics&ie=UTF8&qid=1429697338&sr=1-3&keywords=LENOVA+g50+laptop

Then I opened my computer-->properties and was shocked to see that the windows 8.1 is not activated.
What am I supposed to do to activate the windows genuinely without spending any money?

Thanks in advance

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