Check these two articles
Endpoint Protection system tray icon reports multiple errors after applying Windows security updates from 1/3/2018
https://support.symantec.com/en_US/article.TECH248552.html
Next would be to check the Dcom permission, either of them should fix the issue
Endpoint Protection reports multiple problems in the Windows Notification Area however UI reports no problems
https://support.symantec.com/en_US/article.TECH193508.html
if the above does not fix the issue, please let us know the SEP version