See, thats what I thought. But I'm guessing what the OP means is s/he signed up for a new account and wants to transfer all the contacts to the new account, for which I can not provide an answer.
to transfer your buddy list from one screen name to another you need to be on Windows AIM. there's an option called save buddy list or something, it's under file.then log back in with your new sn and load that .bl list file. then you'll have all your contacts back.