That proves that people prefer it. The cold virus doesn't do anything good. It's not supposed to be good for you, it's just supposed to spread. The main purpose of Windows is to prevent other operating systems from gaining an established base. They deserve the benefit of the doubt.
Capitalism is like any other system in that it relies on the integrity of the participants.
Capitalism can devolve into Fascism under the right conditions. They believe they are judge, jury, and executioner for every other company in the information business. They believe in innovation by the few, not by the many. They believe that in any market they have the right to blow the whistle, stop the game, declare a winner, and then devour that winner. It is not necessary to use deep, philosophical arguments, or to quote chapter and verse from Federal antitrust law, to prove that Microsoft is a dangerous company in need of severe punishment.