Once you get everything working without password or authentication, let us know. It's important to lock down a wireless network as much as possible, within reasonable limits, to keep the baddies from hosing your computers (yes, there are Mac viruses now) or worse, turning your systems into file servers for their own purposes. It isn't _hard_ to protect your network, but it can be involved, so we can give you step-by-step instructions. And don't believe anyone that says you don't have to worry because you have a Mac-they're just harder to mess with, not bullet proof.