Hi naquar,
For me to be able to assist you, please post your e-mail address. Also, please include the exact error message that you are encountering when trying to send messages. In the meantime, I suggest that you visit the link to the Solutions post below. It gives information about the increase in reports that we have received about accounts been hijacked and spam mails been sent to customer's contact list without customer's knowledge.
http://windowslivehelp.com/solutions/safety/archive/2009/04/29/recent-reports-of-account-hijacks.aspx
As for your access issue, the best department to assist you would be the Windows Live Technical Support Team.
I suggest that you visit the link to the solutions post below. It will give information to users who are looking for support for their non-Hotmail issues/questions.
http://windowslivehelp.com/solutions/newvisitor/archive/2009/02/04/how-to-get-support-for-your-non-hotmail-products.aspx
Once you reached the page, click the Windows Live ID link.