Run there removal tool https://support.norton.com/sp/en/us/home/current/solutions/kb20080828154508EN_EndUserProfile_en_us;jsessionid=A1CA8D058C769E6CBA9651D0EFA2F163.4?entsrc=redirect_pubweb&product=home&pvid=f-home&version=1
Once removed you can run manual searches for “Norton and Symantec” to eliminate remnants