Error 0x800141f09 when installing the standalone version of Sophos Anti-Virus

  • Article ID: 117034
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  • Updated: 28 Jan 2016


When installing the standalone version of Sophos Endpoint Security and Control the Sophos Anti-Virus (SAV) component fails and you see the error:

The installation of SAV has failed (error 0x800141f09). Contact your network administrator.

Note: The error is not recorded in an installation file log file and is only seen on screen during installation.

First seen in
Sophos Anti-Virus for Windows 2000+ 10.0.4


You have attempted to install SAV to a folder location which does not allow the account LOCAL SERVICE effective rights to be able to load DLLs and execute code.

Attempting to install SAV to folders such as the user profile area can cause this problem.

What To Do

You need check the 'Users' group is shown in the Discretionary Access Control List for the folder you are installing SAV to and add/set permissions as shown below.

  1. In Windows Explorer browse to the root of the intended installation folder.
  2. Right-click the folder and select Properties.
  3. Select the Security tab.
  4. Confirm that the Windows security group 'Users' ([computerName]\Users) is listed and has (at least) the following permissions:
    • Traverse folder/ execute file
    • List folder / read data
    • Read attributes
    • Read extended attributes

If you are unable to add the group/permissions to the folder then it is not possible to install SAV to this location.

Technical Information

Sophos Anti-Virus cannot be installed without adding LOCAL SERVICE to the access control list.  The default installation folder normally has the 'Users' security group and this grants LOCAL SERVICE the necessary permissions.

The error shown on screen is not recorded in the Sophos Anti-Virus installation log file (Sophos Anti-Virus Install Log_[TIMESTAMP].txt) but you can see in the first few lines of the log if a non-default location has been chosen.  Example:

[DATE] [TIME] Info: Logging started: installing/upgrading Sophos Anti-Virus
[DATE] [TIME] Info: InstallFromPath is: C:\Users\TestUser\Desktop\SAVOnly\savxp\
[DATE] [TIME] Info: InstallToPath is: C:\Users\TestUser\New folder\Sophos Anti-Virus
[DATE] [TIME] Info: SAV is not installed. Installing to {InstallToPath}
[DATE] [TIME] Info: Standalone install

If you need more information or guidance, then please contact technical support.

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