Make sure you are using firefox, IE, or chrome to log in and click play. I think you get the E:3 error when you try to launch directly from the launcher exe. Or maybe reinstalling might help.
edit: derp didn't read it all
Unless you school is super nazi about internets (such as explicitly blocking all ports including windows portscoughhack) it should run fine. If it's blocked, you wouldn't be able to connect either at the launcher or it won't let you connect after you launch it. But yeah I doubt it's blocked.
Last edited by Sandrie; 08-21-2011 at 06:25 AM.