What about the bit that said
"On the iMac open your preferences, select Built-In Ethernet from the list, then click on Configure.
Click on the TCP/IP tab and set the Configure drop down menu to DHCP. Click on Apply Now, then quit Network.
Turn off the the
] modem and the computer and wait about five minutes. Then turn on the cable modem and wait until the status indicators show it's communicating with the network. Then power up the. See if this gets your connection re-established properly."
I'm guessing, I'm using Xp Pro..