[selondoner79]

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Its fixed this issue but now getting 'Permission denied'

Im certain that the login details Im using are correct. Ive also deleted cookies and restarted.

http://xbmclogs.com/show.php?id=91449

XBMC has no permission to write in it's own userdata directory. There must be something wrong with your xbmc setup.
Have you run xbmc as an administrator before? If so, you now have no write access to the folders, that were created by an adminstrator.
Anything like this must have caused it. You could try to just delete the "AppData\Roaming\XBMC\userdata\addon_data\plugin.video.netflixbmc" folder. But if you also have no write access in the parent folder, you probably need to completely delete/backup your "AppData\Roaming\XBMC" folder and start from the beginning...

Thanks for pointing me in the right direction. For some reason my entire C://Users folder was read-only.

Now works perfectly. Really nice app, congratulations on putting together such a great addon.