I forgot my root password

Hi, I have a SuSE 7.1 box with 2.4.7 kernel. I forgot my root password (yes, i am an idiot). How can I make to reset it? I have tried to boot as "lilo: linux single" but anyway he asks me for the root password. I have tried too boot with a CDrom but with same result. Thank you and greetings Alberto Butrico Montevideo - Uruguay