Serial Key Para Mount And Blade How Can I Re-install Windows Vista Home Premium With The Serial Key But No Install Cd?

How can i re-install Windows Vista Home Premium with the serial key but no install Cd? - serial key para mount and blade

I have a Dell Inspiron 1501, which has been tampered with and that someone installed Windows XP on without knowing. In the lower part of the laptop, but still the key to the series, but I have Windows Home Premium installation CD to reinstall Windows Vista. Is there anything I can do?

Thank you!