My Dell laptop has a NIC and a wireless connection. I'm unable to connect to my primary Domain Controller via the NIC card. I cannot ping the primary DC, but I can ping several other servers including the backup DC. When I click the 'Network' button, I can only see 3-4 machines (out of the two dozen machines on the network). I have internet access. I tried different cables, different switches, different ports in the office and got the same result. I even removed my laptop from the domain and rejoined it. I even removed my laptop from the AD on the primary DC. I tried to update the NIC driver. I also restored to a Restore Point from last week when everything was working properly. My IP address is within the correct range.
However, when I connect to the network wirelessly, I can ping and connect to everything, like I have been able to do so in the past.