I simply restrict access to the hosts file, and then add the servers URL to it.
127.0.0.1 www.aol.com <----- repeat for ALL the aol chat servers.
quick buddy is another one to block too since its Javabased.
*shrug* its work, but if your seriously wanting it gone, it works for me.
the kiddies cant access C:\ so they cant get the hosts file...
its not the best way in a open machine, but its how I stopped it.