Ok guys I've just read this page: http://www.irongeek.com/i.php?page=security/changemac
But before I want to attempt anything, I want to ask: Is modifying our MAC Address (in the way provided at that page) a perfectly reversible operation?
plus there's no way anyone can track if you have ever changed your MAC Address?
Btw i'm using 32-bit Windows Vista sp2 Home Premium