They probably have. We have our computers at work updated quarterly, and the last time they were there, they suggested to hold off. But that was about a quarter of a year ago, so it probably is fine, especially since you have seen no problem. Is your anti-virus program updating correctly? If not, it probably is the SP2 firewall. Just check it.
Right.......a while back, I saw some people on FR having some trouble with the installation.......so I held off. But I just did it last week before the election and it works great; love the firewall and the popup stopper!