I cannot receive msgs from my contacts. This is really driving me crazy. Please help!

I had added msn into the exception list in the winxp sp2 firewall. When I enable the option "allow me to cennect directly to my contacts when sending messages" in msn, I can receive some of the msgs sent by my contacts but not all. But if  this option is disabled, every single message cannot be received and "... has left the conversation" appears in my contact's screen whenever he sends a msg.

I also uninstalled all addons in msn and unload the virus monitoring program, but the problem still exists!

Pls help! Any clue is welcome! Thanks!!!

okay, well have you installed the plugins back in?

If so which ones do you have?

It appears you have stuffplug so is the ignore option on?

no, I removed all the plugins.
And may reinstall some only after the problem is solved.
Thanks!