A factory reset will probably do it - means you will have to input all the initial set-up again.
Good luck. Based on what is in this forum, Samsung are incapable of fixing anything relating to Netflix.
Appernatly my Blu Ray has had net flix activated before. How do I get a net activation to come up to register with netflix?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic