Question : Network Cable Unplugged

When I upgraded a PC on my home network from Windows 98 to Windows 2000 the PCI Ethernet Adapter that had been working failed with the error "Network Cable Unplugged. The cable is not, in fact, unplugged. My diagnostics recognizes the adapter's IP Address and it MAC address. What is the likely cause of this malfunction?

Answer : Network Cable Unplugged

Just going to toss in a fast thought.  Drivers seem like the likely answer, but I've also seen outdated BIOS do this, especially if the OEM put some motherboard corrections into the BIOS...Check and make surew your PC has the latest BIOS for it's motherboard.