dell latitude d600

Hello everyone. im technically challenged and need help please. I have an additional laptop which is using a built in wireless chip which to all intents and purpose appears to be working. It seems to recognise my access point but it doesnt find my router/gateway and therefore i cant get internet access. the other laptop is very similar if a little older and works fine. i have 2 laptops and desktop that have no probs connecting. i have tried wireless cards and they work ok too but still no internet. All the others show the internet gateway icon and then i know i have access. i have no problems when its wired up. its driving me crazy. heres an ipconfig if thats any help. thanks adrian Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. C:\Documents and Settings\Sophie Robson Davies>ipconfig /all Windows IP Configuration Host Name . . . . . . . . . . . . : sophie Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Wireless Network Connection: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Dell TrueMobile 1400 Dual Band WLAN Mini-PCI Card Physical Address. . . . . . . . . : 00-90-4B-2C-E5-24 Ethernet adapter Bluetooth Network: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Bluetooth LAN Access Server Driver Physical Address. . . . . . . . . : 00-10-C6-C3-4D-6C Ethernet adapter Network Bridge: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : MAC Bridge Miniport Physical Address. . . . . . . . . : 02-0F-1F-BD-43-EF C:\Documents and Settings\Sophie Robson Davies>ipconfig /all