The main problem isn't always with msn, but with Netpassport. Btw, you dont need to log onto a website to change the username and password, start MSN and click 'Tools, Options, General and deslect 'automatcially run messenger when I log onto Windows, and, Allow automatic sign in when I connect to the internet'... shotdown and reboot, this time when you click onto the msn icon, it will give you the option to log in... and should (assuming msn isnt corrupted) allow you to input your username and password, you can select 'always remember my loggon' at that time.
If this doesnt work, use IE and go to click here and loggin there.
Hope that works for you.
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