I have two computers networked together, a PC and a Sony laptop. I am using a nic card in the PC and the Sony has built in NIC. When I first set this up it worked fine. Now suddenly the system tray icon flashes "Network cable unplugged". If I unplug the cable, they system tray icon just shows a red X. When I plug it back in, it flashes between "Network cable unplugged" and Connection:100Mbs. I have uninstalled the software for the NIC card in the PC and reistalled it, but this did not change anything. The laptop was working fine, I moved from one chair to another and suddenly it would not work anymore. I have re-booted both computers several times, but still no luck. The laptop continually shows red X on the network Icon in system tray. Any ideas?