Where's my java?

[CAT1]

Everytime I try and enter a chat room, my computer tells me java is not enabled. And yes, I have been through "internet options", and, as far as I can see, it should work. It worked fine until a friend of mine decided to "clean up" my system. He does not have a clue what has happened. Anyone got any ideas?

I'm running Windows Me, have Norton installed and use ZoneAlarm firewall.