Cannot connect to wired LAN in windows 7.

[kushalsinghsftt]

I hav Dell Inspiron 1525. recently installed window 7 ultimate. now the wired connection is not working. Shows the following error:
"Your computer seems to be correctly configured
but the device or resource(DNS server) is not responding."

I m not very well aware of the settings and modifications of the computer so kindly help me out as a layman. I m posting the ipconfig /all results.
Also sometimes it gets connected by itself but tends to give the same error later.

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

C:\Windows\system32>ipconfig /all

Windows IP Configuration

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

Wireless LAN adapter Wireless Network Connection:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Dell Wireless 1395 WLAN Mini-Card
Physical Address. . . . . . . . . : 00-22-69-5C-72-20
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Marvell Yukon 88E8040 PCI-E Fast Ethernet
Controller
Physical Address. . . . . . . . . : 00-21-9B-DB-BE-3D
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::95de:5f2a:cd87:c426%11(Preferred)
IPv4 Address. . . . . . . . . . . : 172.31.81.34(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.192
Default Gateway . . . . . . . . . : fe80::64ed:cd5d:c82:d573%11
172.31.81.1
DHCPv6 IAID . . . . . . . . . . . : 234889627
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-EC-F4-E5-00-21-9B-DB-BE-3D

DNS Servers . . . . . . . . . . . : 172.31.100.8
172.31.100.7
NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{EFE174AD-C922-42CE-80DE-77ECB984B0E2}:

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 isatap.{02F4B322-AEE1-4C1E-9090-423A26DE69E3}:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
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

Kindly help me out if u have a solution. Thanx in advance.

[Zachary]

Have you checked the ip address of the computer. See if you are getting the IP from the DHCP Server/modem wireless (if is configured for automatic) or if your are getting an APIPA address. A Windows-based computer that is configured to use DHCP can automatically assign itself an Internet Protocol (IP) address if a DHCP server is not available. The Internet Assigned Numbers Authority (IANA) has reserved 169.254.0.0-169.254.255.255 for Automatic Private IP Addressing. As a result, APIPA provides an address that is guaranteed not to conflict with routable addresses. After the network adapter has been assigned an IP address, the computer can use TCP/IP to communicate with any other computer that is connected to the same LAN and that is also configured for APIPA or has the IP address manually set to the 169.254.x.y (where x.y is the client’s unique identifier) address range with a subnet mask of 255.255.0.0. Note that the computer cannot communicate with computers on other subnets, or with computers that do not use automatic private IP addressing. Automatic private IP addressing is enabled by default.