too, if you haven't run the System Preferences ->Software Update for a while, 10.2.2 is now up to 10.2.6. I can't remember which update also updated Explorer and Java.
You can check if your resources are being overloaded by running the Process Viewer found in your Utilities folder. There are ways to limit LW so you can browse and chat at the same time.
(you'll probably need to do a Safe Boot and Repair Permisssions as well to get your OS up to speed).

Cheers--post back if you'd like the links.