FFxi complete lock up please help.Follow

Final Fantasy XI keeps freezing up completley in game. This problem started about a month ago. I'll be standing around, not doing anything, and the program will lockup to the point where I can't even alt-tab out of it. Or i'll be in the middle of a party and the same will happen. Also I have these pieces of the environment form long planes across the screen pulling away from the object they were supposed to be on. I'm running an ATI Mobility Radeon 1400, the drivers are current, but that hasn't fixed the problem. I'm running TrendMicro right now. Is this a proccessor error, or what is going on? Please help.