MSN Hacked

Hello,

Someone help me please, someone has hacked my MSN changed my password, security question and changed my alternate email address. There is important emails and photos of my son on there and the culprates are printing these off and handing them out, this is serious I just need to retrieve my account back, please please someone tell me how I can do this, and also tell me if this is against the law to do this to an account.

Thanks