New WRT54G wireless router. Who's the genius that can help me?

I just purchased a WRT54G wireless router. The main reason is my son wanted to be able to use his Sony PSP online. I also have two desktop computers that will be wired thru this router. My question's are. If he is using his PSP online and the desktops are wired, can the desktops be "hacked" if they are on/off? If the router is turned off then the wireless is not working? If I access the router and disable the SSID Broadcast then the wireless portion of the network is off? What are the safest security settings to protect my network?
Thanks.

Dead Mans Zone....  I guess.
Using the DMZ is a very simple and risky way to forward ports. The DMZ takes an ip address of a computer on your network, and forwards all ports to that computer. This is really nice if you are having problems forwarding ports for some program. It can be a life saver if your router will not allow you to properly forward ports. It also has a huge downfall. The computer that is in the DMZ is now wide open to internet traffic. Meaning that it will catch virii, and it will be at risk of being hacked. If you put a computer into the DMZ then please install a software firewall to help protect it
Orange/White. The Cisco logo is the Router’s SecureEasySetup button. It lights up and will stay orange when the Router is powered on. The color orange indicates that the Router is not using the SecureEasySetup feature, while the color white indicates that the Router is using the SecureEasySetup feature. When the Router enters SecureEasySetup mode, the Cisco logo will turn white and start flashing. After the Router has generated the SSID and WPA-PSK (also called WPA-Personal) key, the Cisco logo will stop flashing and stay white.
Message Edited by wehowardjr on 12-30-200611:26 AM

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