How To Fix Sophos Error 1603?

The Sophos error 1603 is encountered during product installation. This error is displayed on the last screen of installation. You will see anyone of the error messages from the below list.

Sophos Error 1603
  • As soon as the Sophos error code 1603 is displayed on your computer, close the installation wizard.
  • Restart your computer and then again perform the Sophos application installation process.
  • Make sure that you have downloaded the Sophos installer package that is compatible with your computer.
  • If the Sophos error code 1603 persists, perform the troubleshooting instructions given below.

Solution 1:

  • Close all conflicting programs or applications running on your Windows computer.
  • Locate and press the Ctrl, Alt, and Del buttons simultaneously.
  • Now, select the Task Manager option and open it.
  • Click the Processes tab.
  • The list of currently running programs will be displayed on the screen.
  • To stop a program, select it, and click the End Process button.
  • Similarly, stop all programs that might be interfering with the installation.
  • Then, try to install the Sophos antivirus application on your computer to resolve the Sophos error 1603.

Solution 2

  • Make sure that no other antivirus software is installed on your computer.
  • If installed, disable it and then perform the Sophos antivirus installation process.
  • To disable the antivirus software on your Windows computer, follow the instructions given below.
  • Locate the icon of the installed antivirus application in the notification area.
  • Now, right-click on the antivirus icon.
  • Choose the Disable or exit the program option.
  • Follow the instructions displayed on the screen to disable it.

Solution 3

  • Uninstall or delete the Sophos antivirus installer file.
  • Re-download the installer file and then perform the installation.
  • If the Sophos error 1603 persists, click Call to contact our technical experts.


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