PUNTERS who use the ZoneAlarm security package might not want to install MS update KB951748. According to several news groups, the first thing you will notice after running the update is that your internet connection dies as KB951748 made changes to the networking files that Zonealarm doesn't like. It then decides to block everything just to be safe.
You can get around the problem by setting the Internet Zone Security permission slider from high to medium and that will give you your connection back but that is not really a good idea if you want high security. Sniffing around the forums we found similar advice although, apparently, the best bet is to reset the ZoneAlarm database.