Just wanted to post a heads-up. There is a conflict between Microsoft's update KB951748 and ZoneAlarm. Something about that update will cause ZoneAlarm to block your browsers from internet access and ultimately shut your connection down. ZoneAlarm is recommending that you uninstall this update as a fix for right now. Turning your ZoneAlarm setting down to "medium" will also fix this problem, but obviously will reduce the level of security provided by the program.
I'm pretty sure that I got this PS2 in 2002. It worked fine the last time I tried to go online; unfortunately that was a year and a half ago. Since then I've moved and changed from DSL to cable. The instructions that I got from Comcast are: 1.