> In other words, no computers should be infected because Microsoft already dealt with the problem.

I don't know if this conclusion is entirely accurate, I believe a more correct conclusion would be that "no computers that are patched and supported should be at risk of infection from these specific exploits because Microsoft already dealt with the problem."

I'd assume most of these infected computers are unpatched, unless someone can replicate the malware on an up to date instance of Windows 7+.

This is probably also why Microsoft have gotten so aggressive with patching and updating for better or for worse. (along with the cost savings internally that come with supporting evergreen software)