[insoluble]

Could it be that the "problem" in this case is that Windows has been so popular over such a long period? The popularity not only makes it a desirable target for malware but also makes it a desirable platform for cookie-cutter anti-malware programs, many of which are not worth the bits they are printed on. Another part of the problem is that many people are still running old versions of Windows (some even before User Account Control was implemented), which Microsoft is clearly trying to resolve here with the gratis Windows 10 upgrades.