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Why can't I reinstall my Windows ESET product?

Failed reinstallations are most often caused by a partial or unsuccessful uninstall of a previous ESET security product. If you have attempted to reinstall ESET Smart Security or ESET NOD32 Antivirus after uninstalling an older version and are experiencing performance issues, it is likely that your previous version failed to uninstall.

Check for non-ESET antivirus software

Before continuing, make sure your reinstallation issues are not being caused by another company's antivirus software conflicting with your ESET security product. Click here if you attempted to reinstall your ESET security product with another antivirus program installed on your computer.

If you used the Windows Add or Remove Programs utility and are experiencing erratic system behavior, follow the instructions below for diagnosing a failed installation and fixing your issue using the ESET Uninstaller tool.

How do I know my uninstallation failed?

Your ESET security product has likely experienced an uninstall failure if (after using the ESET Start Menu uninstaller):

  • The ESET splash screen still appears at startup
  • ESET menu items still appear in the Start menu
  • There are ESET security product folders still visible in Explorer and My Computer (e.g. C:\Program Files\ESET)  
  • You have attempted to reinstall your ESET security product but it fails and the installation progress bar hangs or rolls backward
  • During a reinstall attempt, an error message informs you the installer could not write to the ESET Scheduler key and asks you to contact support personnel.
  • You are unable to install another company's antivirus software
  • Network connectivity is intermittent or disabled
  • Your computer displays a blue screen or crashes
  • Other erratic system behavior

How do I get rid of my old ESET program files before reinstalling?

If the above options have failed, it is likely you have a failed installation which can leave behind a number of files, folders, registry entries and program drivers that interfere with your computer's operation. Deleting those files will restore your computer's normal operation and allow you to reinstall your ESET product.

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