@Jonathan Lamothe when I did use microsoft I just used the microsoft virus checker. But the simple truth is that windows is designed to be susceptible to viruses to discourage people from using non-microsoft software. So, the only way to stop the viruses is to stop using Microsoft. That is the only real solution.

@Jonathan Lamothe I have used several operating systems such as Linux, which had no problem stopping viruses on the same machines as Microsoft. If they could do it, Microsoft could easily have stopped viruses. We might have accepted a transitory issue when viruses first appeared, but not a continued issue that continue despite many updates. The truth is Microsoft did very well from all the viruses, because they were used to deter people from trying non "official" microsoft software. That put Microsoft in a very dominant position and that is what made it so much money from some of the crappiest software on the planet.