My Msn Messenger Just Isnt Working....Please Help!!?

When i try to sign in on my msn it says:Your Connection With The .NET Messenger Has Been Lost.Reconnecting In 0.5 Seconds.But it just doesnt connect i left it for about 20 mins and it kept saying the same thing.I have tryed changing my password,restarting my PC and even removing msn and put it back on.My internet connection is fine also i can sign onto my other account with out any problems!! can you please help me!