Hi - I have tried the below step
Delete the following registry keys:
HKEY_USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings
HKEY_USER\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\SavedLegacySettings
clear the contents from below folders
c:\Documentsand Settings\All Users\Application Data\Symantec\LiveUpdate\Downloads
c:\ProgramFiles\Symantec\Symantec Endpoint Protection Manager\Inetpub\content