Can access the Router but doesn't have Internet[Wired]

I can access my router @ 192.168.1.1 and I can also view other computers and access files on the Workgroup my problem is there is no internet.


Router: Linksys WRT54Gv8 Cisco
OS: Windows XP SP2






What I have tried:
I tried to change the port on the router and change the cable.
I tried to do these steps http://compnetworking.about.com/cs [...] ddrwxp.htm (my problem in here was when I type ipconfig/renew the same IP will be obtain).
I tried to turn off the router and pc and wait for several minutes and turn it on.
I tried to turn off the firewall.

ipconfig/all

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Administrator>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : microsof-672b4d
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : VIA PCI 10/100Mb Fast Ethernet Adapt
er
Physical Address. . . . . . . . . : 00-16-EC-0F-76-2A
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.120
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
Lease Obtained. . . . . . . . . . : Wednesday, June 03, 2009 4:37:08 PM
Lease Expires . . . . . . . . . . : Thursday, June 04, 2009 4:37:08 PM

C:\Documents and Settings\Administrator>


None of these doesn't work, Any suggestion or help? Your post will be a great help.