Yes, I left the HOSTS file as writable; I'm not certain when it reverted to Read Only. Thus, I don't know if it was writable during the immunization process, and wonder if it now being read-only might affect future updates.
As for McAfee, yes, I'm aware that some people have issues with it. I've been using it for many years, with practically no issues, and as it continues to look good in terms of tests run by various organizations, I have no reason to change to something else. I know of no anti-virus/firewall/etc. programs that don't have issues. I find it amusing to read about, say, program "A", which is highly praised by many, hated by others, and so on.
And, again, as today was the only time that I've seen McAfee ask about modifying the file, yes it is possible that it is creating a conflict, but I have no way of knowing. I will be interested to see if future immunizations also cause McAfee to query me about changing the file.
Chuckle, chuckle: I was just about to send this missive when I noted that I had just received an email from this system. I checked that email, and, as I suspected, found that it was a notification that you had posted the message to which I was responding. I guess I need to go back in time, wait for your email, and then write this....