Stop saying this, as it's simply not true.
Those folks who don't know what they are doing will get "viruses and other nasty things" (including the dreaded "life-altering identity theft") using whatever Windows they have, be it 7, 8, or 100500.
Those who do know what they are doing are perfectly fine with whatever OS/Paint.NET version they are getting their work done with.
BTW, your documentation still says
Fix it or something, already.