Tuesday 04. January 2011

ESET Outlook Plugin error when starting Microsoft Outlook

Author : ESET Thailand

If you receive the following error message when starting Microsoft Outlook,
The Add-in 'ESET Outlook Plugin' (C:\PROGRA~1\ESET\ESETNO~1\EPLGOU~1.DLL) cannot be loaded and has been disabled by Outlook. If no update is available, please uninstall the Add-in.
please see the information contained in this article.
The error message above may occur on a computer with multiple user profiles after an upgrade, reinstall, or failed uninstall of ESET Smart Security.

Solution 1
: Outlook 2003 and 2007 - Delete the extend.dat file
The extend.dat file contains cache for add-ins in Microsoft Outlook which are activated by the Add-in manager. If you delete the extend.dat file and restart Outlook, a new .dat file is automatically created. The new extend.dat file should contain no inconsistencies and should prevent the error from occurring in the future.
To delete the extend.dat file (Windows XP):

  1. Exit Outlook
     
  2. Click Start  Search  All files and Folders  More advanced options and select the Search hidden files and folderscheck box
     
  3. In the top search field type extend.dat and click Search.
     
  4. In the search results section, right-click on the extend.dat file and click Delete

NOTE:

If Outlook is used by multiple profiles, an extend.dat file exists for each profile. Each extend.dat file must be deleted. By default this file is located in C:\Documents and Settings\Username\Local Settings\Application Data\Microsoft\Outlook.


To delete the extend.dat file (Windows Vista):

  1. Exit Outlook.
     
  2. Click Start and type extend.dat in the bottom search field then click the search icon.
     
  3. Click Advanced Search in the upper right corner. Select the Include non-indexed, hidden, and system files (might be slow) check box on the left. On the right, type extend.dat in the Name field and click the Search button.
     
  4. In the search results section, right-click on the extend.dat file and click Delete.

NOTE:

If Outlook is used by multiple profiles, an extend.dat file exists for each profile. Each extend.dat file must be deleted. By default this file is located in C:\Users\Username\AppData\Local\Microsoft\Outlook


To delete the extend.dat file (Windows 7):

  1. Exit Outlook.
     
  2. Click Start and type Search in the bottom search field then click the search icon. 
     
  3. Click Change search options for files and folders.
     
  4. Click the View tab and select Show hiden files, folders, and drives. Deselect Hide extensions for known file typesand Hide protected operating system files.
     
  5. Click Apply and OK.
     
  6. Click Start and type extend.dat in the bottom search field then click the search icon.
     
  7. In the search results section, right-click on the extend.dat file and click Delete. 

NOTE:

If Outlook is used by multiple profiles, an extend.dat file exists for each profile. Each extend.dat file must be deleted. By default this file is located in C:\Users\Username\AppData\Local\Microsoft\Outlook

Solution 2: Outlook 2003 only - Install Office 2003 Service Pack 3If you are using Microsoft Outlook 2003, you can install Office 2003 Service Pack 3 to resolve the error message. Office 2003 Service Pack 3 can be download from Microsoft’s website, here:http://www.microsoft.com/downloads/details.aspx?FamilyId=E25B7049-3E13-433B-B9D2-5E3C1132F206&displaylang=en