Password problem with windows live mail

My email account is suddenly asking me for my password after many months when it was put in automatically.  I tried entering several of my old passwords but none worked.  So I tried setting up a new account---putting a new password under "servers". But that didn't work either. I still got the message that the new password was wrong . This really surprised me.  I even tried to set up three additional accounts, but nothing worked. I also tried it on another computer with the same result.

JM