I have a couple of different Windows Live accounts, which I use for both email (Hotmail) and messenger.  On one of these accounts I can no longer sign into messenger via Windows Live.  Regardless of the password that is entered, Windows Live goes through the normal process of loading my account, but stays at the starting up part.  When this happens the computer freezes and nothing else will load.  This only happens with one account, other accounts load up and run properly.