Network IP error

Recently I was running Windows Server 2000; and I had a
public IP assigned to one of the NIC's on my server; it
worked fine, but when upgraded to Server 2003 I recieved
this message: Windows cannot connect to a network at this
time. Please update your network address. What do I need
to do from here can anyone explain to me how to fix this
error?

Have you verified the NIC is being assigned the correct
address? You may also want to open the device manager
and be sure the NIC is installed properly. Open the computer
management icon in the administrative tools directory to get to
the device manager..

"Kristopher" <(E-Mail Removed)> wrote in message
> Recently I was running Windows Server 2000; and I had a
> public IP assigned to one of the NIC's on my server; it
> worked fine, but when upgraded to Server 2003 I recieved
> this message: Windows cannot connect to a network at this
> time. Please update your network address. What do I need
> to do from here can anyone explain to me how to fix this
> error?