An experiment ... clean install of Win10x64 Home Premium without any firewall, WinDefender, ad-blockers, anti-popups, anti-virus, anti-malware. Without any Windows Updates (except for two device drivers, lol, but they had nothing to do with security). Running stock IExplorer and Chrome, default settings on everything.
After one week of somewhat "normal" use (moderate browsing, downloading, YouTube/Netflix, some gaming, etc) ... installed all the security software and ran full system scans. Hundreds of minor objects (dataminers and the like) which are basically trivial and nonthreatening. But no major objects - viruses, malware, spyware. I observed many annoying ad-banners and pop-ups during the week which would normally be invisible (blocked from displaying or even downloading). I had my browsers hijacked a few times, annoying but easily fixed by closing all instances and reopening/reloading the tabs again. Surprisingly few popups actually, but I very often found "popunder" browser windows ambushing me after closing down my browsers. Quite surprising, really, I honestly expected far more of an unsavoury mess, especially after my daily visits to a fair variety of dirty-banner-laden torrent sites.
Alas, no worthy infected files/trojans/etc collected from this week-long run that I could quarantine and copy into my archives for future use.
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[/Korth]