SEP keeps rolling back
If we have virus in system we cont install the antivirus before installing antivirus we should clean the system with third party tools like NNS, stinger combofix, Trozen remover.....etc......
After cleaning the machine we should uninstall the SEP old version after uninstalling we should delete the symantec folders in the client machine i.e.,
Go to 'C' drive progream files and delete the symantec folder and go to common files and delete the symantec folder and document settings all user application data delete the symantec folder
Restart the machine and install the SEP new version update with latest version.