Did you download the latest Messenger installation?

http://explore.live.com/windows-live-essentials?os=winxp



This post has been edited by netmatrix2: Jul 14 2010, 10:01 PM

From what i know Live Messenger supports

@live.com
@hotmail.com

and not other that is not linked to Microsoft.

If you cannot log in to MSN with one of the above accounts extensions, it could only mean that the account is removed by MSN or damaged in some way. But i could be wrong and probably you need to delete .NET passport in user if you are using Windows XP. Else this problem should not arise. To delete .NET passport in Win XP go to

-Control Panel
- User Accounts
- Click on your user name
- Click manage my network passwords
- Delete the account name that cannot work. You can delete all too.

Restart PC and try again. If still cannot. Then try to login hotmail using the account that could not sign in. If cannot login, you could have forgotten the password. Or your account is damaged or removed. MSN has a policy to remove inactive accounts after certain period. Good luck.