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How do I uninstall or reinstall ESET Smart Security/ESET NOD32 Antivirus? (4.x)


  • Newer program release requires reinstallation
  • Corrupted installation is preventing installation or uninstallation
  • Outlook errors associated with an ESET uninstallation

I am a business user


A new version has been released

A new version of ESET Smart Security and ESET NOD32 Antivirus has been released. We highly recommend that you upgrade to the latest version.

  • Remember: ESET Smart Security and ESET NOD32 Antivirus 9 use a License Key for activation. What is a License Key?

  1. Download
  2. Uninstall your existing ESET security product
  3. Reinstall
  4. Troubleshooting

I. Download

  1. Download your ESET product using one of the links below. You will need your unique username and password to download your ESET product. Be sure to check your operating system version before downloading.


ESET Smart Security 4.x    ESET NOD32 Antivirus 4.x


ESET Smart Security 4.x    ESET NOD32 Antivirus 4.x


  1. When prompted, click Save and save the file to your Desktop. 

II. Uninstall your existing ESET product

VIDEO: How do I uninstall ESET Smart Security or ESET NOD32 Antivirus? (4.x)


  1. Click Start → All Programs → ESET → Uninstall. After you uninstall, you will need to restart your computer.

  2. After restarting, confirm that you can see hidden files and folders by clicking Start → Control Panel → Folder Options → View and select the Show hidden files and folders option.

  3. Click Start → My Computer and then navigate to and delete the following folders:

    C:\Program Files\ESET
    C:\Documents and Settings\All Users\Application Data\ESET
    C:\Documents and Settings\%USER%\Application Data\ESET

    Windows Vista and Windows 7 Users must delete the following folders:

    C:\Program Files\ESET


The uninstaller may remove the above folders automatically. If you are unable to find the folders after selecting Show hidden files and folders, the removal is complete.

III. Reinstall

  1. Navigate to your Desktop or wherever you saved the installation package file and double-click it to open.

  2. Follow the instructions in the ESET Installation Wizard to install your ESET product. For more detailed installation instructions, please click here for ESET Smart Security 4.x or click here for ESET NOD32 Antivirus 4.x.

IV. Troubleshooting

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