First of all, make sure Windows XP SP-2's firewall isn't enabled. If your computer came with SP-2 installed or if you updated your system with the SP-2 update, more than likely, the Windows firewall is enabled. Many times, its firewall clashes with a third party firewall like Norton, Sygate, Zonealarm, etc. As for the IPCONFIG/ALL command, it will show you your current IP address, the subnet and the gateway's IP address. For example:
Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp.
C:\\Documents and Settings\\Doug>ipconfig/all
Windows IP Configuration
Host Name . . . . . . . . . . . . : PERSONALPC Primary Dns Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Unknown IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No DNS Suffix Search List. . . . . . : cfl.rr.com
Ethernet adapter Wireless Network Connection:
Connection-specific DNS Suffix . : cfl.rr.com Description . . . . . . . . . . . : NETGEAR 108 Mbps Wireless PC Card WG
511T Physical Address. . . . . . . . . : 00-07-B5-83-19-49 Dhcp Enabled. . . . . . . . . . . : Yes Autoconfiguration Enabled . . . . : Yes IP Address. . . . . . . . . . . . : 192.168.0.3 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.0.1 DHCP Server . . . . . . . . . . . : 192.168.0.1 DNS Servers . . . . . . . . . . . : 1192.168.0.1 Lease Obtained. . . . . . . . . . : Monday, May 09, 2005 5:52:32 PM Lease Expires . . . . . . . . . . : Monday, May 16, 2005 5:52:32 PM
Ethernet adapter Local Area Connection:
Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : National Semiconductor DP83815-Based PCI Fast Ethernet Adapter Physical Address. . . . . . . . . : 00-0A-BG-37-8D-FF
C:\\Documents and Settings\\Doug>
Anyway, unless you're getting a bogus/private IP address like 269.154.x.x, you should be able to connect to your wireless AP especially if encryption is disabled. Once you're connected, and are able to surf the internet and/or share your files and printers, then go ahead and enable encryption. My guess is that the Windows Firewall is enabled. Go to the Control Panel and click on Windows Firewall, then disable it. Reboot and try to connect.