Try unblocking these ports both on the firewall, and on your router.
Messenger server: port 1493, 1542, 1863, 1963, 80 TCP and 443 TCP
File Transfer/Sharing Folders: local: 1544 and 6891 - in fact 6720-65535 TCP
from one source
Messenger Update: remote: 80 local: 1457
Remote Assistance If available): 3389 TCP
Audio: local: , 1556, 11771, 13803 and generally 5004-65535 UDP
Remote Desktop and whiteboard: local/remote: 389, 522, 1503, 1720, and 1731
Launching Games: 80
Video Conference: TCP 9000-9999, 5004-65535 UDP + 80
Sign-In: remote: 443 local: 1484, 2400
See if that helps.
--
Have a nice day,
Jonathan Yaniv
Microsoft Windows Liveâ„¢ Butterfly Expert
Visit the ButterflySays Blog at
http://spaces.msn.com/ButterflySays/
"Jen;x" <Jen;> wrote in message
news:A25E3886-63EE-4606-87B4-...
> after the update my msn keeps disconnecting.. and it's started to do my
> head
> in. it's all good on firewall etc.
> i have windows xp and we use a linksys router. i'm also on a wireless
> connection.
> help me please 
>
> "Jonathan Yaniv" wrote:
>
>> Do you have a router by any chance, and what operating system are you
>> using,
>> Windows XP, or Windows Vista?
>>
>>
>>
>> --
>>
>> Have a nice day,
>>
>> Jonathan Yaniv
>> Microsoft Windows Liveâ„¢ Butterfly Expert
>>
>> Visit the ButterflySays Blog at
>> http://spaces.msn.com/ButterflySays/
>>
>> "Joe Medford" <> wrote in message
>> news:B3B88289-30ED-4256-B75F-...
>> > Disable Zonealarm and see what happens
>> >
>> > "KKK" <> wrote in message
>> > news:824AB3E1-69AE-4363-BC8B-...
>> >> after the update my msn keeps disconnecting every minute. i use zone
>> >> alarm
>> >> firewall and anti virus. i have put msn messenger as a trusted program
>> >> and
>> >> allow them for all actions. please help me
>> >
>>