Unusual network problem, local IP techs can't solve

Hi all first post, hopefully someone here can help with this perplexing problem, I'm in Iceland and the local ISP's tech couldn't solve so I'm hoping someone here can.

The simplified version.

I have adsl through my ISP which provides both TV and internet. I am connected through their router, directly cat 5e through one switch which splits off to main floor cable box and then into the computer room.

Here's the interesting part, when connecting directly to my laptop I get a internet connection no problems. Take the same wire over to the desktop and nothing works, only rarely is it even able to do a ping or tracert.

At this point I figured a possible hardware issue, onboard ethernet. So I used a wireless NIC and then a normal expansion NIC with the same results. Figured at this point, likely motherboard problem. So at this point when I was about to buy a whole new mobo, I wen't to my brothers house with my desktop, hooked up the computer and bam the internet worked instantly with no problems.

So this is a very unusual one, I'm not a total noobie and have tried lots of fixes from these and other forums. The specific error message I get when using win7 diagnostic on the adapter is:

Ip config error: doesn't have a valid ip configuration

So the ultimate question is if the hardware is ok, why does my desktop refuse to work with the same connection that works perfectly on my laptop.

Thanks for any help, I'm at a loss and anxious to finally figure out what is going on here.

If you can post your ipconfig /all of the problem machine while it's connected that might help to figure out this problem.

C:\Windows\system32>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Thor-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : NVIDIA nForce 10/100/1000 Mbps Ethernet #
2
Physical Address. . . . . . . . . : 00-24-8C-46-E9-80
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Autoconfiguration IPv4 Address. . : 169.254.143.165(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{4CF11DBD-26E1-4D09-A56C-49F76B895AD3}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Btw removed the check for Ipv6 as part of the troubleshooting attempts with the tech from the ISP, in case you wanted me to turn that on for the ipconfig.

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Windows\system32>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : Thor-PC
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : lan

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Marvell Yukon 88E8071 PCI-E Gigabit Ether
net Controller
Physical Address. . . . . . . . . : 00-1D-72-F1-28-6A
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::bd83:720f:f825:ca22%12(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.66(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, October 02, 2010 4:31:45 PM
Lease Expires . . . . . . . . . . : Wednesday, October 06, 2010 7:13:37 PM
Default Gateway . . . . . . . . . : 192.168.1.254
DHCP Server . . . . . . . . . . . : 192.168.1.254
DHCPv6 IAID . . . . . . . . . . . : 268442994
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-D0-1B-ED-00-1D-72-F1-28-6A

DNS Servers . . . . . . . . . . . : 192.168.1.254
NetBIOS over Tcpip. . . . . . . . : Enabled

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Intel(R) WiFi Link 5100 AGN
Physical Address. . . . . . . . . : 00-21-6B-0C-75-AE
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.lan:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . : lan
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:5ef5:79fd:382d:1f1b:6262:4b88(Pref
erred)
Link-local IPv6 Address . . . . . : fe80::382d:1f1b:6262:4b88%13(Preferred)
Default Gateway . . . . . . . . . : ::
NetBIOS over Tcpip. . . . . . . . : Disabled

C:\Windows\system32>

I have currently disabled, the new NIC I bought to see if it was my onboard Lan. It was able to get a bit further by showing I was connected to the internet but not loading any pages. I'll try to recreate that again to get some more useful ipconfig all for you.

It might help to reset winsock and the TCP/IP stack.
Try running these commands at your command prompt run as admin.

netsh winsock reset catalog (reset winsock entries)

netsh int ip reset reset.log hit (reset TCP/IP stack)

Do you have anything from apple or adobe installed like iTunes or adobe photo suite?

Currently on my trendnet nic, attempted the fix you suggested (which I think the tech tried) without any success. It just shows unidentified network and the red X to the internet.