Causes of Error 8504, 104

  • Corrupt file download or failed installation of Norton software.
  • Corruption in Windows registry from a recent change in Norton software (install or uninstall).
  • Virus or malware in system that has corrupted Windows system files or Norton related program files.
  • Another program mistakenly deleted Norton related files.
  • Another antivirus or security product already installed.

To fix the problem, use the Norton Removal Tool

To fix the problem by another security program, uninstall any non-Norton security software that appears on the list under Installed Programs in your Control Panel.

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