How to block massenger chat in windows XP

[Punya]

I am useing OS windows XP sp2 in my PC. i have to block windows live massenger, yahoo massenger and any chat programs. How to block this programs in my PC? if you have any idea. please write suggestion .

 

[DelJo63]

Blocking IM by firewall port controls

there are programs that do some of this

http://www.imfirewall.com/en/msn-chat-monitor.htm​

but firewall controls will help in some case (other than the lame Windows Firewall)
by adding rules to DENY specific ports;
Ports Yahoo! Messenger uses!

Yahoo! Messenger services uses a variety of ports.
Service                 Ports
Chat & Messenger        TCP Port 5050: Client Access only
Insider/Room Lists      [COLOR="Red"]TCP Port 80: Client Access only [*][/COLOR]
File Transfer           [COLOR="Red"]TCP Port 80: Server Access.[*][/COLOR]
                        Your ISP may block this port, as its used for web hosting.
                        You can change port in Messenger, Preferences, File Transfer.
Voice Chat              UDP 5000-5010
                        TCP 5000-5001: Client Access
                        If UDP Fails, TCP will be used instead, see below.
WebCam                  TCP Port 5100: Client Access
Super Webcam            TCP Port 5100: Server Access
P2P Instant Messages    TCP Port 5101: Server Access
PMs between Buddys may not use the Yahoo! Server, but this is not a requirement.

[*]You can NOT block port 80 as this is how your browser gets webpages!

MSN Messenger uses

 port 1863 TCP/UPD

ICQ & AIM

 Because AIM and ICQ can switch port automatically, so you can not block them only by disable the ports in the firewall. We recommend you to block AIM/icq in two ways:

    * 1). [COLOR="Red"]Block all AIM/ICQ server IP address.[/color]
    * 2). Use firewall which has deep content inspection capabilities. Use firewall which has deep content inspection capabilities to block AIM/icq's P2P function.