Expectant parent, that message is configured as your signature. Follow the steps below on how to remove it:
1. Sign in to your Windows Live Hotmail account.
2. At the upper-right corner of the page, click "Options" and then click "More options."
3. Under "Customize your mail," click "Personal e-mail signature."
4. Remove all the entries in the signature box then click “Save.”
On the other hand, please check out this link for info on what happened to your account and what are the other things that you should do to secure it:
http://windowslivehelp.com/solutions/safety/archive/2009/04/29/recent-reports-of-account-hijacks.aspx