Problem with Router

I have 2 computers they are connected through a router, i can go online but when i try to play... uhh lets say games with each other it will either give me an error or it will just not show the room. There is a game called Counter-Strike when i try to join the same server as the other computer it would disconnect one of us and let the other one join in. I checked the ip adress of both comps and its the same ip.. Please help someone here is my ipconfig /all settings.

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

C:\>ipconfig /all

Windows IP Configuration

Host Name . . . . . . . . . . . . : gamin
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . : dsl-verizon.net
Description . . . . . . . . . . . : Realtek RTL8139 Family PCI Fast Ethe
rnet NIC
Physical Address. . . . . . . . . : 00-30-BD-1F-1C-0E
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.101
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 4.2.2.66
4.2.2.5
4.2.2.6
Lease Obtained. . . . . . . . . . : Tuesday, July 20, 2004 3:07:20 PM
Lease Expires . . . . . . . . . . : Friday, July 23, 2004 3:07:20 PM

C:\>

PS: THE ROUTER IM USING IS A CABLE/DSL 4-PORT ROUTER model NR041

The two computers should not have the same IP address - this should be something unique to the computer. Check that NAT is enabled on the router, and perhaps try setting the IP config manually for the second computer with the following details:

IP Address: 192.168.1.102
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.1.1
DNS Servers: 4.2.2.66, 4.2.2.5, 4.2.2.6