uninstall inbuilt vista

hey,
i hv purchased a laptop n i got inbuilt os "vista" in it.Now,want to remove vista from it.Can u tell me how can i crack its (vista's) key?

I don't know why you want to remove the operating system of your system. If you want to install another operating system then simply install it on to the system and this will remove the windows vista from the laptop. As far as i know the cracking of keys is an offense or illegal so forget this.