lol!
Yes, I saw D'Artagnan became a musketeer by the end of the book when I looked it up, so you can totally go with four musketeers. And if a fifth hosts file entry starts being unimmunized, I suggest you call it Albert.
https://en.wikipedia.org/wiki/Albert...ifth_Musketeer
I'm really curious on the immunization problem, since there seems to be all different security software amongst the computers in the posts so far and I can't think what else might cause just four unimmunized hosts file entries or what the common denominator might be amongst the computers. Good luck with support, I hope you find out what is causing the immunization problem.