Hi welcome to the forum
Researching I cannot find, at the moment a way to stop the notice, short of actually contacting customer services.
It may be a fault, as you suggest, BUT IT MAY NOT.
There might genuinely be a problem? Password, infringement etc.
Maybe contact them, see if it is a genuine reason? From their side if it is good reason they will keep sending!
The link is Windows Live help, where your issue is covered briefly. But site full of good tips.
Sorry I could not be of more help to you. Search Results
Hope this helps. http://mail.live.com/mail/troubleshooting.aspx