Activating/Registering ESET Smart Security or ESET NOD32 Antivirus—FAQ

Are you a Mac user?

Frequently Asked Questions:

I have a 3-computer license and receive an error during activation - what do I do?
If you receive an error message (such as "Activation failed") during activation, it is likely because you already used an Activation Key when you installed your first computer. After activating your first computer with an Activation Key, you should receive an email from ESET with your License Key, which should then be used to activate your remaining computers (reinstallations of ESET also require that you use your License Key).

For instructions ot install and activate on your second and third machines, see How do I activate and install ESET Multi-Device Security?

How do I activate my ESET product?
If you purchased your ESET product from a third-party vendor, you must activate the software to receive a valid License Key.

Do I need to activate my ESET product?
If you already received a License Key or Username and Password from ESET, then you do not need to register your serial number / activation key again, but make sure that you enter your Username, Password, or License Key into your ESET product. Without a properly entered License Key, you will not be able to receive the virus signature updates that are critical for maximum protection.

What password should I use when completing the online form?
The password for the activation form is made up by you and is unrelated to any ESET Username and Password that you receive via email.

I receive the error message telling me that my serial number or activation key I entered is incorrect.

  • Make sure to enter the serial number/activation key exactly as it appears.
  • Your serial number/activation key is case sensitive and any hyphens are necessary. A big "0" is the number zero (0), a little "o" is the lowercase letter o.

How do I know if I have successfully completed the activation process?


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