runnubg Dcpromo

You need to plug a into the NIC. The red x means "Media Disconnected". This is what is keeping you from installing AD. The AD install for some reason requires network connectivity. So hopefully you have a hub, or another computer or something, so the NIC at least is connected to something. like I said it doesnt matter what, it just needs to be connected.
Also you will need to configure a static IP address, as DNS will not install to a DHCP enabled machine. When you configure the TCP/IP settings you need to set the DNS entry to point to itself, as AD needs to update DNS with the SRV records for AD.
hope this gets you started.

A couple of issues.

1. The red X means that the nic is disconnected, it needs to be connected to a hub or switch for some reason before dcpromo will install AD

2. AD install requires a static IP, configure this and the appropriate subnet first.

3. AD requires DNS, either pre-installed, or it will install it as a part of AD install. I suggest installing DNS first, and that way you can configure it correctly. AD does not configure reverse-lookup zones. You must do this manually. Don't forget to configure DNS to be dynamically updateable. Point your NIC at the dns server (it's own IP address)

4. Finally run dcpromo and you will be up and running. dcpromo looks for dns and if it can;t find it will do the install as a part of AD install

You can install the Microsoft looback adapter to complete the installation.

Click Start, point to Settings, click Control Panel, and then double-click Add/Remove Hardware.

Click Add/Troubleshoot a device, and then click Next.

Click Add a new device, and then click Next.

Click No, I want to select the hardware from a list, and then click Next.

Click Network adapters, and then click Next.

In the Manufacturers box, click Microsoft.

In the Network Adapter box, click Microsoft Loopback Adapter, and then click Next.

Click Finish.

That's it

Everything said by others is ok but try this.
Tonight we install AD in 15 servers. They had static IPs and the nic cards were ok. about 2/3 of them got the same error message as you did. What we found out was that when you enter the domain name andyou get the "cannot find the network" notice, you have to do this. First,enter the domain name in the window. Second, after you enter the domain name clck on the browse button. This will open a dialog box with your domain name listed. Click on the domain name and click ok. This worked for us and it may work for you. This must be a bug in W2k server. Also we started dcpromo at the command prompt.
Good Luck.
Mike