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Error code 331 and/or 311,0xfffffb59 appears when installing the Security Agent of Worry-Free Business Security (WFBS)

    • Updated:
    • 31 May 2021
    • Product/Version:
    • Worry-Free Business Security Advanced 10.0
    • Worry-Free Business Security Standard 10.0
    • Platform:
    • Oracle Linux 6 32-bit
    • Oracle Linux 6 64-bit
    • Oracle Solaris 11 SPARC
    • Oracle Solaris 11 x86
    • SaaS すべて
    • Symbian ^3
    • Symbian S60
    • Symbian S60 3rd Edition
    • Symbian S60 5th Edition
    • Ubuntu 10.04 32-bit
    • Ubuntu 10.04 64-bit
    • Ubuntu 10.1 32-bit
    • Ubuntu 10.1 64-bit
    • Ubuntu 11.04 32-bit
    • Ubuntu 11.04 64-bit
    • Ubuntu 12.04 32-bit
    • Ubuntu 12.04 64-bit
    • Ubuntu 9.1 32-bit
    • Ubuntu 9.1 64-bit
    • UNIX すべて
    • VMware ESX - 5.0
    • VMware ESX 3.0
    • VMware ESX 3.5
    • VMware ESX 4.0
    • VMware ESX 4.1
    • VMware ESX 5.0
    • VMware ESXi 3.5
    • VMware ESXi 4.0
    • VMware ESXi 4.1
    • VMware ESXi 5.0
    • VMware ESXi 5.1
    • VMware ESXi 5.5
    • VMware Server 2.0
    • VMware vCenter 5.0
    • VMware vCenter 5.5
    • VMware vSphere 4.x
    • VMware vSphere 5.0
    • VMware vSphere 5.1
    • VMware vSphere 5.5
    • Windows 2000 Advanced Server
    • Windows 2000 Professional
    • Windows 2000 Server
    • Windows 2003 Enterprise
    • Windows 2003 Small Business Server
    • Windows 2003 Standard
    • Windows 2008 Enterprise
    • Windows 2008 Essential Business Server
    • Windows 2008 Small Business Server
    • Windows 2008 Standard
    • Windows 2011 Small Business Server Essentials
    • Windows 2011 Small Business Server Standard
    • Windows 2012 Enterprise
    • Windows 2012 Web Server Edition
    • Windows 7 32-bit
    • Windows 7 64-bit
    • Windows 8 32-bit
    • Windows 8 64-bit
    • Windows Vista 32-bit
    • Windows Vista 64-bit
    • Windows XP Home
    • Windows XP Professional
    • Windows XP Tablet PC
    • Windows Mobile すべて

You encounter the following error messages when installing the WFBS Security Agent:

Installation unsuccessful. The installer could not prescan the computer. Search the Trend Micro Support site for Error code 311,0xfffffb59.

Error code 311,0xfffffb59

Installation unsuccessful. The installer could not copy the required files. Please restart the system and try reinstalling the Agent. Reference: Error Code 331.

error code 331


These error codes appear when the Security Server of WFBS is installed on legacy systems. It can also happen with different root causes. To resolve the issue, do the following steps where applicable.

  1. Uninstall the Security Server.
    1. Click the Start button > Control Panel > Programs and Features.
    2. Select Trend Micro Worry-Free Business Security from the list of installed programs and then click Uninstall.
  2. Download the installer of WFBS 10.0 SP1 (or higher) from Trend Micro's (changed link) Download Center. Make sure that you select the region and language applicable to you.
  3. Install the Security Server of the latest WFBS version using the downloaded installer. After successfully installing the Security Server, you will be able to deploy the Security Agents without any issues.

For installation error encountered involving prescan, you may try to disable the prescan option when creating an installer/client package. Then, retry the installation until successful. Refer to the KB article: Disabling prescan during Client/Server Security Agent (CSA) installation in Worry-Free Business Security (WFBS).

For installation error code 331, this may be caused by remnants from previous installation. To manually removing remnants of previously installed security agent, refer to the KB article: Manually uninstalling the Security Agent (SA) in Worry-Free Business Security (WFBS).

If issue persists, feel free to contact Trend Micro Technical Support.

Troubleshoot; Deploy; Install
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