Your operating system may contain vulnerabilities in which antivirus software will not prevent an attack.
Microsoft, Apple, and other various software vendors release software patches often.
Malwarebytes is a professional Anti-Malware software that is used by consumers to remove malware from their computers.
Malwarebytes can be downloaded for free at the following website https://
Even though Symantec includes a real-time Autoprotect feature, this does not scan your entire computer making it important to run Symantec at least once a week.