The add-in 'C:\Program Files\Symantec_Client_Security\Symantec AntiVirus\vpmsece.dll' could not be installed or loaded.

http://service1.symantec.com/SUPPORT/ent-security.nsf/pfdocs/2004060116454248?Open&dtype=corp

delete extend.dat from

c:\docu..settings\userprofile\local..settings\application data\microsoft\outlook