In fact, if you regularly update vulnerabilities and have a good anti-virus awareness, such as not feeding a stranger to your website, it will bring more protection, but it doesn't matter. Like me, I just installed 360 security guards and used BitDefender. ) there is a ZA firewall, which is actually nothing. Later, with Kaspersky and Rising Firewall, there was nothing, no virus, and now nothing is useful. The main task of virus-free is to update the system vulnerabilities regularly, and then you will achieve good anti-virus awareness. If the company's machine is another matter and has important files, you must install anti-virus software and kill it regularly!