code 5 error

Hi everyone . could someone please save me !! first i have a macbook pro 2.8 i7 lion os . i tried to install windows 7 using parallels and i didnt like it so i tried downloading it using bootcamp . i burned the same windows 7 iso file on a dvd and started , it went ok then i restarted my mac , after that i get a black screen written on it cannot boot from cd code 5 . And i cant do anything . I closed it several times and its the same . I cant eject . I tried.holding the option key an still nothing happened . Plzzz anyone help me asap