If you insist on running untrusted executables and refuse to fix that problem, then you're screwed and antivirus doesn't change that. It's plausible AV will increase the amount of time your system is usable between reinstalls, but that is not security.
Sure, and if a stranger calls and you agree to fedex them your laptop and creds, then you're gonna get hacked. Not doing that should be in the guide, write after "this is equivalent to running an exe they sent you" 
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Sure, put that it in the "how to not be hacked" guide if you think it's likely. I don't object to that one, I object to the "install antivirus" one
End of conversation
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