If you pirate your copy of windows 7, it is not a genuine copy. Only copies of windows 7 that are purchased from the store/microsoft or copies that are authorized by microsoft (such as school approved downloads) are genuine. If you want a genuine copy of windows 7 you must either:
A. Buy a copy of windows 7 from the store or from microsoft.
B. Buy a computer that is preloaded with a legit copy from a store such as bestbuy.
C. Download it legally from a microsoft approved vendor, like a college software program.