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
Tmlisten
TmFilter
VSApiNt
TMPreFilter
TM_CFW
OfcPfwSvc

Now find this Registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro

Delete the following keys:

OfcWatchDog
Pc-cillinNTCorp
RemoteAgent
PC-cillin

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.

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