How To Fix Sophos Error 1721?

Sophos error 1721 is encountered while performing the product installation, upgrade, or uninstallation process. As a result of this error, the Sophos product remains uninstalled, and the error message Uninstall Failed will be displayed on your computer screen. Sometimes, the Sophos error code 1721 is also related to the Run time issues. Perform these troubleshooting methods to solve the error 1721 on your Windows system.

Sophos Error 1721

Steps to solve the Sophos error-1721 occurred while installing, upgrading, or uninstalling the Sophos antivirus product

  • On your Windows computer, open the Regedit tool.
  • Go to the HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\ file location.
  • Search for the Sophos antivirus application’s uninstall key in this location.
  • Find the location of the Sophos antivirus application file installed on your computer.
  • Now, navigate to the folder path C:\Program Files(x86)\Sophos\Sophos Anti-Virus.
  • Select and copy all the files displayed in the above folder.
  • Paste the copied files in the C:\Program Files (x86)\Sophos\Sophos Anti-Virus\NATIVE.EXE or \SAVONACCESSDRIV.INF or \SOPHOSBOOTDRIVER.INF location.
  • Now, perform the Sophos antivirus installation, upgradation, or uninstall process as per your desire.
  • If you are unable to install, upgrade, or uninstall the Sophos antivirus application issue persists, click Call.

Steps To Solve The Runtime Error 1721

Solution 1: Close the Conflicting Programs present on your Windows computer

The conflicting programs present on your Windows computer may also cause the Sophos error 1721. To close the conflicting programs, follow the instructions given below.

  • Launch the Task Manager window on your Windows computer.
  • Click the Processes tab.
  • Select each program one-by-one displayed on the screen and click the End Process button.
  • After closing all the conflicting programs, try to perform the Sophos antivirus install, upgrade, or uninstall process.

Solution 2: Update or reinstall the Conflicting Programs

Using your Windows computer’s Control Panel wizard

  • For the Windows 10 users: Go to your computer’s control panel section.
  • Search and select the conflicting program causing the issue.
  • Click the Update or Uninstall button.
  • If you click the Update button, wait for the upgrade process to complete.
  • If you want to Uninstall, perform the instructions displayed on the screen to complete the uninstallation process.
  • After that, reinstall the conflicting programs on your Windows 10 computer.
  • Check if the Sophos error 1721 for runtime is solved.

Solution 3: Update the antivirus software and your computer’s OS

  • If you have installed any antivirus application on your computer, update it and then check if the Runtime error 1721 is cleared.
  • Check if there is an update available for your Windows OS.
  • If so, update your Windows computer’s OS.
  • Then, check if the Runtime error 1721 is solved.


Our website offers only instructions for a learning purpose and does not duplicate any brands or product manufacturers, including their images, content, or any trademarks as provided in Disclaimer. The company reserves the legal right to change any content on the website at any time. We are not liable for the data or file loss on your device in case of any third-party intervention occurs without our knowledge.

Antivirus Setup