Internet lost after uninstalling Norton Security

Im helping a familymember with her pc.
It had previosly installed Norton Security verion 2010 I think.
This was the AV given by the bank (internet bank solution). Then the bank switched

from offering AV from Norton to Mcafee instead. The Mcafee installer was executed

and it was told that the Mcafee would remove older AV SW. So Mcafee started this

job. But in the middle of this uninstall/install process the internet connection was lost.
The PC would then not complete the uninstall/installation process beacuse the

network was gone.
The PC was rebotted several times without pos. response.
Neither wlan or lan works.
I tried to force unistalling Norton, because it seems some parts of Norton still is there.
I ran the uninstalling tool and it reported this process went OK.
But still no network.

The PC is a ASUS 3820T with WIN7 and network HW is atheros WLAN and LAN.

The WLAN finds the router and reports the corrct SSID but it will not get any IP.
The setup on PC is dynamic, but I tried Static IP on the PC aswell same neg result.
The WIN7 network and sharing center says that the network is unidentified. I can not

select it to be home, public or work.
I have the same result on two separate routers in different houses, so the  problem is

PC related.
I have done the system restore function to set the system back to the time when just

Norton was installed and the system was working OK. Still no pos. result.

Do you have any idea?