Bob has noticed that Leo hasn't been advocating for antivirus software lately, and his subscription is expiring. Should he renew it? Leo says that most malware hacks are Zero Day now, and security programs aren't really effective against them. Antivirus software even can cause problems. In general, antivirus software isn't really worth subscribing to. Windows Defender is free and offers protection that is perfectly fine. The best defense is his online behavior, and keeping the OS updated.
Of course, he could also move to Mac. In general, they are more secure. But there's more business apps on the Windows side.