How can I change my Xbox LIVE Email address If I no longer have access to the Email?

Ok,I have bought a PS3 and no longer need my Xbox,but I cant cancel my subscription to Xbox without having Access to the accounts Email Adress.Is there anyway to change the Email of the Xbox Live account to the Email address I use,The email I used to sign up with the account had an error in it(Spelling Typo.) And I cant access the account considering It's not a real Email.I'd like to change this to my proper email so I dont need to keep paying for something Im never going to use again.