[T]he Playboy Advisor once took on a three-pronged question from a reader who was (1) worried about sexually-transmitted diseases, (2) suffering from premature ejaculation, and (3) dissatisfied with the size of the unit. The Advisor recommended:
- Wear a condom.
- Wear two condoms.
- Wear three condoms.
This sort of additive protection, as it were, does not work on PCs. After reviewing some of the more questionable decisions made by our end users, we have determined that the efficiency of one’s antivirus protection varies inversely with the square of the number of antivirus products installed on any one box.
In other words, if you have two AV programs running, you have one-fourth the protection; three of them, one-ninth. (Spyware detectors and such interact differently, and cannot be so easily quantified.)
And no, you don’t want to know how many we found on [description of machine redacted].