Start - Run
type smc -stop ( If it prompts for password; navigate to HKEY_LOCAL_MACHINE\\SOFTWARE\\Symantec\\Symantec Endpoint Protection\\SMC, delete the smcexit key and then type smc -stop)
Navigate to HKEY_LOCAL_MACHINE\\SOFTWARE\\Symantec\\Symantec Endpoint Protection\\SMC
look for smcinstdata key; delete it
go to add/remove program and uninstall Symantec Client