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Undocumented Serious Error in ESET Windows home products


  • Undocumented Serious Error 0x101a
  • Undocumented Serious Error 0x1106
  • Cannot update the virus signature database


Before you begin

  • Make sure you are using the latest version of your ESET product
    Many of the issues you might be experiencing with your ESET product have been resolved in the latest version. We highly recommend that you upgrade to the latest version: How do I upgrade?
  • Remove any other security software from your computer
    This error is often displayed because another network security program is already installed. Uninstall all other security programs before you install ESET.
  1. Open your Windows ESET product. How do I open my ESET product?

  2. Press F5 on your keyboard to access Advanced setup.
  3. Click Update and click Clear next to Clear update cache.

    Figure 1-1

    Why is Clear update cache greyed out?

    If Clear update cache is greyed out, restart your computer and then attempt to update again (Before you restart, click here to bookmark this article). After your computer has restarted, repeat steps 3-5, Clear should now be active.

  4. Expand HTTP Proxy, select Do not use proxy server from the Proxy mode drop-down menu, and then click OK.
    • Version 8.x and earlier: Click Setup, click the HTTP Proxy tab, select Do not use proxy server and then click OK.

    Figure 1-2

  5. Restart your computer. Before you restart, click here to bookmark this article
  6. After your computer has restarted, open ESET Smart Security or ESET NOD32 Antivirus. How do I open my ESET product?
  7. In the main program window, click UpdateUpdate now. Your ESET product should update automatically from now on. If the issue is not resolved, uninstall and then reinstall your ESET product.

    Figure 1-3

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