The computer sees the airport signal but cannot connect to the internet

Question

I have a imac g5 connected wirelessly to my base station & an airport express. The mac part connects to the internet using the network without any problem. My problem is that the pc portion (using Windows XP) of my imac will not connect to the internet using the wireless network. It shows a strong signal but no connectivity. One of the comments that comes up is that the network didn't assign a network address to the computer (I assume the PC portion). Any thoughts how I can get my computer to connect to the wireless network from the PC portion of my mac.
many thanks.

Answer 1

Make sure your Firewall settings are correct. I'm going to share some of my settings in the PC area (please bear in mind that these IP addresses could differ from system to system)
My Windows Firewall is DISABLED. You could do the same temporary and see if it works. I use Zone Alarm Pro Firewall. Make sure in my Control Panel ==> Network connection status, your device shows Airport Express wireless device or router.
Depending in your Internet service provider and geographical zone the IP address could be different.
Example:
Zone Alarm Windows settings:
TRUSTED ZONES ==> Loopback Adapter 127.0.0.0.1
PC IP address 192.169.1.3 (example)
Gateway 192.169.1.254
DHCP Server 10.0.1.1
DNS 10.0.0.1
IN AIPORT EXTREME SETTINGS ( Make sure you are in your Imac side or Mac Os)
Id 192.169.1.5
Subnet Mask 255.255.255.0
Router 192.169.1.254
Connection Automatic
Ethernet ==> Automatically (through Airport Utility)