When you start Microsoft® Outlook®, you see the following message:
"The add-in 'C:\Program Files\Symantec_Client_Security\Symantec AntiVirus\vpmsece.dll' could not be installed or loaded. This problem may be resolved by using Detect and Repair on the Help menu. Unable to load "C:\Program Files\Symantec_Client_Security\Symantec AntiVirus\vpmsece.dll". You may be out of memory, out of system resources, or missing a .dll file."
When Symantec AntiVirus 10.x is installed, the error message may reference the file vpmsece2.dll , vpmsece3.dll or vpmsece4.dll.
Use of the Detect and Repair option, as suggested in the error message, does not solve the problem.
On the Windows taskbar, click Start > Search > For Files or Folders.
Under "Search for files or folders named," type the following text:
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 "C:\Documents and Settings\
<local_user>\Local Settings\Application Data"
is the name of the current local user.
Type cd microsoft\outlookand then press Enter.
Type del extend.dat and then press Enter.
Delete the Extend.dat file for every user local 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.
Technical Information 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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