This is only occuring on one computer, and it just started recently (until this week, I've had no such problems from it):

It has two NICs (tried running both one and then both, no difference), and neither one will connect to either WAN or LAN. I can't even ping computers on the same LAN, as I get "Destination host unreachable" or "Unknown host [computer name]."

So I ran an ipconfig, and got nothinge more back than "Windows 2000 IP Configuration". Nothing else.

Ran an ipconfig all, and got:

Host Name.......................: [my computer's name]
Primary DNS Suffix............: [our domain]
Node Type........................: Broadcast
IP Routing Enabled...........: No
WINS Proxy Enabled.........: No

And if I try an ipconfig /renew:

"Error: No adapters bound to TCP/IP are enabled for DHCP."

Now here's the kicker -- There is no static IP address configured, it's ALL dynamic. The latter message usually indiciates a preset static IP. So now what do I do? It can't communicate with any computer within or beyond the LAN.