Cannot identify IP for eth0 or eth1

I am new to Asterisk. My computer had Windows XP previously. I copied Asterisknow image to CD and booted my computer from CD.

I chose Express Installation.
And chose remove all partitions.

My systems boots Asterisk, but it cannot start GUI Asterisk.

This is the error I keep getting (I tried to slove it by creating a new CD and installing it again – no use)

Cannot identify IP for eth0 or eth1, to start GUI.
Press Alt+F2 to boot to terminal mode.

It is asking me to configure an IP address and give me the following root.

you need to do sudo su to obtain super user access.

Please help me. Mine is a standalone system.