Messenger/Hotmail

I am another one that is suddenly having issues signing
into anything using a passport account.. Hotmail email
and messenger particularly.

It says the username/password is invalid, yet it works
fine from another XP system. other valid
usernames/password also fail on teh "bad" system.

it seemed to appear after an automatic update was loaded.

Any thoughts/ideas on where to start ? all of the help
items don't assist with this.