Error: The add-in "C:\ProgramFiles\Symantec Antivirus\vpmsece.dll"could not be installed or loaded.

21 Nov 2009

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	Error: The add-in "C:\ProgramFiles\Symantec Antivirus\vpmsece.dll"could not be installed or loaded.

Solution Microsoft Outlook error: "The add-in 'C:\Program Files\NavNT\vpmsece.dll' could not be installed or loaded . . ."

To fix the problem, find and delete all copies of the Extend.dat file on the computer. A copy of this file exists for each user account. Then, restart the computer.

To find and delete copies of Extend.dat
Exit Outlook if the program is open.
Confirm that Windows is set to show hidden and system folders.
On the Windows taskbar, click Start > Search > For Files or Folders.
Under "Search for files or folders named," type the following text:

extend.dat

Click Search Now.
Wait for the search to finish.
Delete all copies of the Extend.dat file.
Restart the computer.

If a Group Policy that hides system files is in effect, you may not find the Extend.dat file when you search or browse, even after you set Windows to show all files. If you do not find any copies of the Extend.dat file, use a command prompt to delete the file(s).

To find and delete copies of Extend.dat from a command prompt
Exit Outlook if the program is open.
On the Windows taskbar, click Start > Run.
In the Open box, type cmd and then click OK.
At the command prompt type the following command and then press Enter:

cd %appdata%

The prompt shows the Application Data folder for the current user.

Type cd microsoft\outlook and then press Enter.

Type del extend.dat and then press Enter.
Delete the Extend.dat file for every user account on the computer.
Restart the computer.

Note: On some versions of Windows, a user folder called LocalService is present. For example, on Windows XP, you may need to delete a copy of the Extend.dat file from the folder \Documents and Settings\LocalService\Local Settings\Application Data\Microsoft\Outlook.

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This problem happens because the Extend.dat file contains cached information. Outlook does not update the contents of the file when you start Outlook. When you delete the Extend.dat file, Outlook creates a new copy of the file with current information from the registry.
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19 Sep 2008 02:26 PM