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Failed to install Sophos Anti-Virus for Windows: 8000ffff

Sophos User4475

I have a remote user trying to install Sophos on their laptop. It's errored out every time. The error message is "Failed to install Sophos Anti-Virus for Windows: 8000ffff" . I've un-installed, rebooted, re-installed. Same error. Not sure what to do next. 



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  • 0 in reply to Sophos User4475

    Good Evening,

    I've experienced a similar issue where Sophos Central reported the following error below:

    • Failed to install Sophos Anti-Virus for Windows: 8000ffff

    From the users perspective they saw a "Installation Failed" message. Upon some investigation, I narrowed it down to a conflicting AV, i.e. McAfee. I'd recommend seeing whether this the problem you're experiencing.

    • Remove the pre-existing AV (McAfee),
    • Remove Sophos Endpoint Protection,
    • Restart PC,
    • Then reinstall using the "SophosSetup.exe".
  • 0 in reply to Mitch_51

    Thank you for your response. Unfortunately, that's the first thing I checked and there were no other anti-virus programs installed. 

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