Unable to connect to my network (DHCP issue)

Hello,
Here is a description of my issue:
My thinkpad T43 (running on XP/SP2) has lost its connectivity to my router (Netgear WGR614) after being connected without an issue for several months. Both wireless and ethernet adapters are unable to reconnect. I also have a T60 and a HP desktop that are connected to the same router, via wireless and ethernet cable respectively.
The IPCONFIG command shows the adapters as 'media disconnected' and a "ipconfig  /renew" command comes back with an error "unable to contact your dhcp server".
Following are what i have attempted with no success so far::
1. Upgraded the Thinkpad access connection utility
2. Upgraded the router firmware
3. Repaired/reinstalled the wireless adapter
4. Restarted the WirelessZero service
4. Downloaded and ran the LSPFix and WinsockFix utilities
5. Manually executed the following:
Reset TCP/IP stack to installation defaults, type: netsh int ip reset reset.log
Reset WINSOCK entries to installation defaults, type: netsh winsock reset catalog
6. Rebooted the thinkpad,router and cable modem several times in several sequence
After i reset the TCP/IP stack, the ip config has defaulted to a 169.x.x.x address. I understand that it is caused when DHCP server is not available to assign an address, but how do i get this to work?
I have even tried to force an ip address through the TCP/IP properties and manually assigned the router's ip as the default gateway and DHCP server address in the setting, to no effect. In this case, the thinkpad connects to the wireless network but does not connect to the internet.
I have looked at other threads discussing similar issue and have mostly followed their suggestions to no avail. Can someone please help me fix this issue? I will be left with only this thinkpad in a few days, so i have to get this fixed.
Your help and patience (in reading this email) is much appreciated.
Thanks.
Solved!
Go to Solution.

I tried to connect to the only unsecure network available in my vicinity, but i could not. The same issue followed.
What i notice in the result of running ipconfig is this: (In addition to the LAN and wireless adapters, i see another  interface)
Tunnel adapter Teredo Tunneling Pseudo-Interface:
Connection-specific DNS Suffix .:
IP Address...................................:?
Default Gateway..........................:
I do not remember when this started showing up, but im sure this was not listed in the begining of this problem. Does anyone know the use of it or if this is causing the problem?

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