1. Verify that your Internet connection is active by visiting ESET's home page.
    
2. Clear the update cache:
   1. Open ESET Smart Security or ESET NOD32 Antivirus. How do I open my ESET product?
       
   2. Press F5 to open the Advanced Setup window.
       
   3. Expand Update, click Update and then click Clear (see Figure 1-1).

3. Verify that your username and password have been entered correctly and click OK.

Figure 1-1
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4. Restart your computer.
    
5. Open the main program window and click Update → Update virus signature database.

Figure 1-2
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If you are still unable to resolve your issue, contact ESET Technical Support.