How to ‘re-activate’ my pirated windows 8.1?

I downloaded a pirated copy of windows 8.1, and all was fine. But today it is asking me to activate it. I used the same code key provided when I installed it, but now it says it is a standard key or something or other… how do I activate it? Meaning, where do I find another key? Help please!
Answer #1
http://forums.mydigitallife.info/threads/49108-KMSpico-Official-Thread use this
Answer #2
Or this:
http://www.google.com?t=2354964
Answer #3
AWESOME guys!! Thank you so much. The message telling me to activate it, is gone. THANKS!!!!!!!!!!