Try this
Back up reg first
check following reg string .
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\AppData:
Change the value=%APPDATA% to value=%USERPROFILE%\AppData\
Change to >>> Change the value=%APPDATA% to value=%USERPROFILE%\AppData\Roaming
Make sure folder are removed for Sep from Drive:\program data\symantec\sep\
and program files\common files\symantec\
remove Iive update is installed from programs and features and reboot the client machine
Install Sep