I accidentally changed network settings and now I can't connect to internet

(I posted this on the board for OS X 10.4, but I figured my OS is irrelevant to my problem, so I thought I'd post it here for a better chance of getting help)
I accidentally changed some network settings on one of the computers on my network, and now it wont connect to the internet. All the other computers on the network work fine. I guess I need help getting things back to how they were.
I have absolutely no experience with networks, so I don't have a clue what to do. One thing I notice that might be of help is that when it's set to "Configure: Using DHCP," the section for "Router:" is blank. No address. The router address on all the other computers is 192.168.1.1. Similarly, the IP address on all the computers is some variation of 192.168.1.x, but on the problem computer it's a completely random number (as far as I can tell).
Any help would be EXTREMELY appreciated.
Thanks!

Open Network preferences on the computer, select the connection method, click on the Advanced button. Click on the TCP/IP tab and set the Configure IPv4 drop down menu to DHCP. Click on the Apply button.
BTW, you need to post your questions in the appropriate forum which would have been the appropriate Tiger forum. This is the Snow Leopard forum.
Message was edited by: Kappy

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