Hi OR, what I was trying to say is that it is your modem that you need to go into and change the rules in. So the company that made your modem is who you need to talk to!
As far as blocking Trojan programs, for that you need a good software firewall! the free version of zonealarm is a good starting place. Windows XP has a firewall built in, but I call it a one way wall, it only blocks stuff coming in, not going out.
Come see me at Systematic Investing group #board-966 lets talk formula plans.