The Add-in “Symantec Antivirus Outlook protection”(C:\program Files\Common Files\Symantec Shared\vpmsece.dll) cannot be loaded and has been disabled by Outlook.Please contact the Add-in manufacturer for an update.If no update is available, please uninstall the Add-in.

SOLUTION: Close Outlook.

Browse to Documents and Settings\<local user>\Local Settings\Application Data\Microsoft\Outlook

delete extend.dat