logginto into msn messenger 6.2

I have windows xp, msn messenger 6.2. I have untill yesterday had no problems getting into msn mesenger, yesterday i started getting the message that i am using the the wrong user name or the wrong password. Both are correct, I can log into passport and hotmail but not to messenger. I have gone to the control panel and removed it and then reintalled it and it still does the same. I had zone alarm firewall, i disabled it, then removed it from my computer and it still is giving me the same message. Like I said I can get into mymsn.com, passport and hotmail, just not messenger please help in simple terms so i can get it. Thanks