Windows genuine trick

Hi friends!!!! I am back again with very interesting topic.
Most of people use Windows OS. original Windows come in some computers built-in. That Windows is original Windows copy. but in market most of Windows dvds are pirated. which is not genuine copy... now after installing that Windows after 30 days Windows will start to tell you that your Windows copy in not genuine. buy another windows copy.... this is very common problem... but everyone is confused that what to do??

No doubt that there are some cracks available but it's somewhat risky. because it is illegal by law..
but don't worry. I am here for you... I am going to tell you 100% legal method.... please do say.

1. click on start button or press Windows key.
2. type cmd.exe in search bar.
3. right click on it and choose run as administrator.
4. after opening command prompt type  " slmgr -rearm " ( without quotes )
5. press enter key....
6. wait for 5 seconds. press ok.
7. restart (reboot) your computer.

enjoy your fully legal Windows copy for next 1 month... this take only 10 seconds hardly....

I hope this will help you. please give us your feedback.........
Good bye........