is the latest build 9600 windows 8.1 because i had windows 8 and updated to windows 8.1 and lost my activation key. the only way is to buy a key but i dont wanna. i think i get all updates but i dont know. its not bothering me tho. it say that i have build 9600 is that good for windows 8.1? and it shouldnt me lowering performance right? i just dont have the money to buy a new key. I RESEARCHED THE ONLY WAY I RE ACTIVATE IS BY BUYING A NEW KEY DONT ASK ABOUT IT I CALLED***