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OS's can be different error codes are usually across the board.

Error Code 80048820 MSN Messenger Troubleshooting

ZoneAlarm is a software firewall. If you have any sort of software firewall it could be blocking MSN as well even though your Windows Firewall is open.

If it has an error code, knowing what it is...

Do you have zonealarm?

Do you click the remember me box? Try clearing that and re-entering credentials.

Do you have another account you could try and log in as?

Is there an error code?
...

Firstly, lets capitalize and use punctuation. (pet peeve)

Secondly, re-write what's happens when you try to tick. You've included short answers and to me it makes no sense!