I have a dell laptop ,it worked fine in the small network Then I was experimenting with different anti virus and Zone Alarm I put in Kaspersky then took it out , put in ZA and nod32 and left them in . then the problem developed . The lan ethernet connects but no network connection 'The network did not assign a network address '.So I took out ZA and nod32 ,no difference . there is another 2 pc's connected to the network working ok , i tried rerunning the set up network wizard again no . I tried to run ipconfig / all it flashes momentarily on the screen only .It is the IP address that's the problem ,I think, but how to fix it? could someone please help .