I have windows 7 and i have to upgrade to windows 8 to explore new features ,
question here is :- once I am upgraded to windows 8 , i would have new serial key .
so what will happen to old serial key ???? will that still be live or finished .
and once my system goes down , how i would be able to rebuild my machine and which serial key would be valid one ?
because at that time , i am just upgraded .