A good antivirus should keep your computer safe at any given time. However, this is the ideal situation. In real life, some viruses and malware manage to infect computers.
Kaspersky antivirus is a good option to maintain your computer safe since this program is designed to stop viruses and also to protect you from phishing malware as well. You should think of using other products from Kaspersky ever since the best antivirus for your PC software will not add a firewall.