SBS 2011, Dual onboard NICs, Realtek PCI NIC. The PCI NIC works fine and has been working fine. In an effort to "fix" the onboard NICs, I downloaded a driver. When it didn't work I uninstalled it. After that the working Realtek (PCI GBE Family Controller) no longer shows up in Network Connections. However, it still works and shows in Device Manager.
When asked if I wanted to delete the driver software, I chose no. Now that I can't see it in Network Connections I am unable to adjust the IP which was the whole point.