Whoever said to power-off the modem was right. Here is their answer:
"Power cycle your modem. Power cycling will reset the modem to start
from the beginning. Power cycling the modem is to unplug the power cord
(if you look at the back of the modem you will see a black power cord)
from the wall outlet or power bar. Wait 2 full minutes prior to plugging
it back in. Wait another full minute before proceeding.
Close all programs on your computer and reboot it. "