I'm not quite sure what you mean here, but the if the windows boxes you're looking at have firewalls, they're likely to not show up on ICMP pings -- most windows firewalls seem to block them by default. Then again, so does Linksys' firewall. As to port 2, I don't happen to recall what it is, but doubt windows has a daemon answering on it by default, which could explain it.

Update: I'm informed (by gjb, thanks) that the 2 isn't a port number, it's a timeout.