Uninstall Trend Micro OfficeScan without a Password

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It could be necessary to remove an old version of TrendMicro OfficeScan from some clients, but none remember the old password (administrative) to run the uninstaller.

Method 1

To inform TrendMicro OfficeScan to uninstall properly (even when you don't remember the password), do the following:

  • Edit Ofcscan.ini file. (Do a search).
  • On Windows 95/98/XP machines it is usually in C:\Windows\Ofcscan.ini
  • On Windows NT/2K/2003 machines it is usually in C:\WINNT\Ofcscan.ini
  • Open the Ofcscan.ini file using notepad search for the [INI_CLIENT_SECTION]
  • Find the line reading Uninstall_Pwd= and type a # at the beginning of the line to comment it out.
  • Insert a new line saying Uninstall_Pwd=70
  • Save the Ofcscan.ini file and retry the uninstall. When it prompts you for a password, enter a '1'.
  • Method 2

    If the method above doesn't work (or you can't find the Ofcscan.ini configuration file), then we'll have to remove manually from the registry and from services:

  • Go to Control Panel —> Administrative Tools —-> Services — and stop these services:
  • OfficeScanNT Listener
    OfficeScanNT RealTimeScan
    OfficeScanNT Personal Firewall (this one may not be enabled – don’t worry if you don’t see it)

  • Run Registry Editor. Click Start —> Run —> then type regedit.exe
  • Find this registry key:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services

  • Delete these keys:
  • Ntrtscan

  • Now find this Registry key:

  • Delete the following keys:
  • OfcWatchDog

  • Next Find this registry key:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  • Delete the OfficeScanNT Monitor key.
  • Now find the following registry key:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

  • Delete the OfficeScanNT key.
  • Delete the OfficeScan program group (TrendMicro OfficeScan Client) from the Windows Start menu.
  • Restart your computer.
  • Delete the directories that contain the OfficeScan Client program files, normally located inside Program Files folder.
  • NOTE: If you are trying to remove an early version of the client, these registry keys and services involved may not be the same.