Hello,
That would be because the username and password used was blacklisted by NOD32 and Eset for being illegit. Plus if you used a username and password for a NOD32 Antivirus or Business editiion for Eset Smart Security Suite it would not work. Different versions have different passwords and usernames.
Check to make sure that 1. It is exactly the same from the email sent by them. 2. That it is exactly the same version as listed in the email.
Cheers,
Mak