Immediately change your password.
If that is not possible, you will need to recover your account. MSN Support may reply here later to assist. They will need to know your email address. If you type it here, it will only be visible to Support.
If you have lost access to the account:
If you cannot reset the password through the usual means, see this page for information on how to get help with it:
There is a form to use that Support will act on, but it can take more than a day for them to deal with it. Be sure to enter both the account you cannot access and another account where they can reach you. Once you regain access to the account be sure to set an alternate email address and secret questions and answers for account security at http://account.live.com/
You may also want to review these posts:
And also these blog entries from the Windows Live team:
Also see the information here:
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