[KB2878] I receive an installation error message "Error 2878" when installing my Windows ESET product


  • You receive an installation error message such as one of the following:

Error 2878,

Warning: Other security products were found OR,

Installation Error. Please try again, or download and install offline installer

Error messages

Figure 1-1
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    1. If you are installing from a CD, follow this link to activate your ESET product and register your serial number with ESET.

    2. In this Knowledgebase article, locate the link associated with the antivirus software currently or previously installed on your system:

    3. ESET Live Installer will automatically detect your operating system and architecture (32-bit/64-bit) and will install the latest version of your ESET product. Click the appropriate link below to download the ESET Live Installer for your product:

      Download ESET Smart Security Premium

      Download ESET Internet Security

      Download ESET NOD32 Antivirus

      Click Save when prompted and save the file to your Desktop.

    4. Once the download has completed, you may be prompted to click Run and begin the installation process. If the installer does not run automatically, navigate to your Desktop or wherever you saved the download file and double-click it to open.

  1. If the software is still detected, click Ignore.

Warning Other security products were found

Figure 1-2

  1. Follow the instructions in the installation Wizard, or for illustrated instructions, visit one of the following ESET Knowledgebase articles for your product:


    1. If you receive the same error message, please contact your previous antivirus vendor for assistance in removing their software from your computer.

  1. If you continue to experience issues after completing all of the steps above, follow the instructions in this ESET Knowledgebase article to create and submit a log file to ESET: