They did not infect machines; they just popped up that it found all kinds of things that were not there at all and you should upgrade to fix the issue. That is

They did not infect machines; they just popped up that it found all kinds of things that were not there at all and you should upgrade to fix the issue. That is also a rancid tactic but I think Norton (or Mcafee?) also did it (it has been a long time but I remember either or both of them trying to panic users into buying like that). After upgrading, it would scan and nothing would be found; or at least not what it said before upgrading.