Turn off the power to your modem and, if you have one, your router. Then, wait 10 seconds or so and turn on first the modem and let it fully initialize (all lights solid other than PC activity). If you have a router, turn it on after the modem is fully initialized. You should then be set.

Optionally, you can go to the start menu and choose Run. Type:

ipconfig /release
ipconfig /renew

(Do the first, hit OK, then go back into Run and do the second.)

Either should reset your router/modem and get you back up and running when you have that sort of error message.

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