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Fix Sophos Antivirus Error 1721

If the Sophos antivirus software fails to get installed on your computer, the error 1721 may occur. It is an installation failure error that occurs due to various reasons. Check the log details to get a clear idea about the attempted installation. If you want to know the correct reason for installation failure, check the installation logs to run an analysis and check which components have caused the error.

Sophos Antivirus Error 1721

The error may also occur if the uninstallation process of the Sophos antivirus software fails. Otherwise, the runtime error 1721 occurs when the antivirus software fails or crashes while it is running. You may find it annoying when the error appears on the screen as the error pops up without any warning. Proceed with the steps that are given below to fix the Sophos antivirus error 1721.

  • If there is a problem with the Sophos antivirus installer package, open the Task Manager window by pressing the Ctrl + Alt + Del buttons together.
  • The Task Manager contains information about the processes, services, and applications running on the computer.
  • Click the Processes tab and select the process which you believe to be the cause for the error. Click the End Process button.
  • Now, check if the error is cleared. If the error appears again, then end the other processes one by one to identify the process causing the issue.
  • If the error does not appear again, open the last closed program, and resolve the error.
  • Now, press the Windows and R buttons together to launch the Run dialog box.
  • Type Regedit in the search section and hit Enter.
  • Now go to the following location: HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\
  • Now, locate the Uninstall key for the Sophos Anti-Virus software.
  • Now, go to another machine in which the same version of Sophos antivirus is running. In that machine, go to C:\Program Files (x86)\Sophos\Sophos Anti-Virus.
  • Copy the files mentioned below and paste it to your machine where the error has occurred in the folder mentioned here: C:\Program Files (x86)\Sophos\Sophos Anti-Virus\  
  • NATIVE.EXE
  • SAVONACCESSDRIV.INF
  • SOPHOSBOOTDRIVER.INF
  • Now, try to install the Sophos software to fix the Sophos Antivirus Error 1721.