Hiyya CZ and welcome I think someone is having a lend of you mate unless they meant your edition of the OS is chained to the mobo - forever!
By that I mean that when you installed it the first time the motherboard is linked to that activation code which is why you cannot put it (the OS) on a different machine's board.
Having said that if the board gets fried or irreversibly damaged then most times a quick call to Microsoft and explain to them the situation as I did fairly recently they will let you put the edition on another board
The registry mate is just part of the OS