Did you set up the Lan card and your browser to access the router?
If any firewalls are installed on any of the PCs, uninstall them.
This includes Zone Alarm, Sygate, Kerio, Norton Internet Security, Zero Knowledge Freedom, Cisco VPN Client, F-Secure, McAfee Firewall, Trend Micro, etc.
In many cases, disabling the firewall is not enough; you have to actually uninstall it.
Do not install or re-install the firewall until after you have the network functioning properly
Web Browser Settings
Start your web browser. Select “Tools” then “Internet Options”.
In the “Internet Options” screen, there are three selections:
“Never dial a connection”,
“Dial whenever a network connection is not present”
“Always dial my default connection”.
If you can make a selection, select “Never dial a connection”.
If you cannot make a selection, go to the next step.
Under the “Internet Options” screen, click on “Connections”
Select “LAN Settings”
Make sure there are no check marks next to any of the displayed Options:
“Automatically detect settings”,
“Use automatic configuration script
“Use a proxy server”.
Then click “OK” again in the “Internet Options” page.