--Have a way to access the Netflix account just in case. Don't delete device from the account online, just on wii as listed--
1.When you get the Error it says you can DeactivateAccount. Do So.
2.Then as posted above delete both the save data, and channel from the wii.
-2a.As an optional step, leave the wii unpluged for 15 minutes.
3. Re-download Netflix channel
(When you re-sign on, the screen should change from red with black letters to black with red letters.)
4.You will have to setup the email/password.
Deactivate forces it to get a new -??? device address, like re-registering the console..
Anyways it worked for me, hope it helps