Pardon me if I'm repeating, as I haven't read all the replies.

I think this guy is using a cable modem at home, and he's getting these broadcast messages. If this is the case, then turn of your Messenger service. If you're using Win98 or 95, you wont' be able to do this.

Otherwise you should use a personal firewall.....especially if you're using Win95 or 98.

Good luck bro.