Symantec Endpoint Protection.... we have to tolerate that POS at work on the workstations running Win 10 Enterprise and the Symantec is a massive resource hog. I'd find something else if you can. Otherwise, I'd obey the admonition and uninstall it, find a different AV. Without the licensing info for the installation of Symantec that you're running, you've got no other choice if you want to upgrade to 10, which if you are on 8 would be well worth it.
'09 Subaru Forester ...................(QSED DEXOS1 5W30)
'16 Moto Guzzi Stelvio 1200 .....(ENI i-Ride PG 10W60)