Manually Remove Trend Micro Officescan Client

  1. Go to Control Panel Services (services.msc), and stop the following services:
    • OfficeScanNT Listener
    • OfficeScanNT RealTimeScan
    • OfficeScanNT Personal Firewall (if enabled)
  2. Run Registry Editor (regedit.exe).
  3. Navigate to the following registry key



  1. Delete the following keys (if available):
    • Ntrtscan
    • Tmlisten
    • TmFilter
    • VSApiNt
    • TMPreFilter
    • TM_CFW
    • OfcPfwSvc
  2. Navigate to the following registry hive:



HKEY_LOCAL_MACHINE \SOFTWARE \Wow6432Node\TrendMicro (in 64-bit Windows operating system)

  1. Delete the following keys (if available):
    • OfcWatchDog
    • Pc-cillinNTCorp or OfficeScanCorp (depending on the client)
    • RemoteAgent
    • PC-cillin
    • CFW
  2. Browse to the following registry key hive:

HKEY_LOCAL_MACHINE \SOFTWARE \Microsoft\Windows\CurrentVersion\Run

  1. Delete the OfficeScanNT Monitor key.
  2. Navigate to the following registry key:


  1. Delete the OfficeScanNT key.
  2. Delete the OfficeScan program group (Trend Micro OfficeScan Client) from the Windows Start menu.
  3. Restart the computer.
  4. Delete the directories that contain the OfficeScan Client program files, normally located inside Program Files folder.

Above steps work for OfficeScan 7.x client in Windows 2003/XP/2000/NT/Vista/2008 machine. For Trend Micro OfficeScan Corporate Edition (OSCE) – 5.58, OfficeScan Corporate Edition (OSCE) – 6.5, Client / Server / Messaging Suite for SMB – 2.0, follow these manual uninstallation steps instead.

  1. Delete the Trend Micro OfficeScan Client program shortcut in Start Menu, by right click on it and then choose Delete.
  2. Delete the installed files located in the OfficeScan folder under the \Program Files\Trend Micro\OfficeScan Client directory.
  3. Open the Registry Editor (regedit).
  4. Navigate to the following registry key:


  1. Delete the following keys:
    • OfcWatchDog
    • PC-cillin
    • PC-cillinNTCorp
  2. Also delete the following registry hives:
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeScanNT Monitor
    • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\OfficeScanNT
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ntrtscan
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmfilter
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tmlisten
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TmPreFilter (for Win2003)
    • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VSApiNt
  3. Right click on My Computer

, click Manage and then select Device Manager.

  1. Enable the Show Hidden Devices option.
  2. Remove the following hidden devices in Non-Plug and Play Drivers tree pertaining to OfficeScan (right-click and select Uninstall):
    • Trend Micro VSAPI NT
    • Trend Micro FILTER
    • Common Firewall Driver
    • NTRTSCAN (if available)
    • TMLISTEN (if available)
  3. Restart the OfficeScan client machine.


Author: Thomas Faddegon

Do you like my posts and want to do something back? You can buy me a beer :)