Question/Issue:
When you start Microsoft Outlook, you receive an error message.

Symptoms:

• "The add-in 'C:\\Program Files\\Symantec_Antivirus \\vpmsece4.dll' could not be installed or loaded."
  • This problem may be resolved by using the "Detect and Repair" in the Help menu.
• Unable to load "C:\\Program Files\\Symantec AntiVirus\\vpmsece4.dll".
  • You may be out of memory, out of system resources, or missing a .dll file.
• The error message may reference the file "vpmsece3.dll" or "vpmsece4.dll."
  • Use of the "Detect and Repair" option, as suggested in the error message, does not solve the problem.

To fix the problem, navigate to Add-in Manager in Microsoft Outlook and uncheck Symantec AntiVirus 10.
• In Microsoft Office 2003, the Add-in Manager can be found in:
  • Tools> Options... select the Other tab then Advanced Options... Then Add-In Manager...
    
    
• In Outlook 2007 the Add-ins is located in the Trust Center:
  • Tools> Trust Center..., then select the Add-in on the left side.

Then check in the drop down box at the bottom called "Manage". Go through all 3 choices, Com add-ins, Exchange client add-ins and Disable add-ins. If that does not fix the problem, find and delete all copies of the "Extend.dat" file on the computer. A copy of this file exists for each local user account. Then, restart the computer.

 

 

 

Note:  This information was taken from Symantec's own Knowledge Base.  Document 2007121314073048

Source:  http://service1.symantec.com/support/ent-security.nsf/docid/2007121314073048?Open&seg=ent