Just some points I'm curious to the answers to...
Let me preface with a side note...I also can stand up on a chair and announce I've not been infected in XXX amount of years...I think it's been over 12 or 14 years. When I did get infected back then, it was my home rig, my girlfriend at the time had opened up an attachment from her work e-mail, and it had some worm in it that came via Outlook contacts. It was her corporate e-mail (Pfizer), and she kicked herself for not knowing better. I can't remember what OS It was, I fixed it in about 1 minute.
I have run "naked" in the past. Have not in recent years...as installing MSE just takes 30 seconds or so and it's done. And Windows 8 rigs come with it already...so doesn't really use up my time. Even on antiquated hardware (I have a mid-vintage Core 2 Duo with 8 gigs of RAM on a pair of Raptor HDDs)...it runs quite well with Defender.
Anyways...my point is...
*I don't understand how people say "I'm too smart to catch a virus!" Most of in the IT field are aware that the majority of malware these days comes in via the web...good old HTTP. By surfing everyday websites. This includes tech forums, like this one right here. A lot of people say "I know what websites to stay away from, I'm smart!" Uhm...you're here! On a VBulletin website. And I bet you go to other "tech forums". HardOCPs forums were hacked into so many times...I can't count. Malware dumped into its visitors many times. I bet those "tech guys" thought they were too smart to get malware too! Your local banks website. Your local newspapers website!
The only "smart" way to 100% be sure not catch a virus is to not plug in your computer, leave it turned off.
Everyone says "Well I don't go to porn sites...I know where not to go!" That's so 15 years ago! It's everyday normal adult rated G websites that get hacked into with drive-by installs coded into them. And the bigger reasons...streaming advertisements that websites subscribe to. Every day those popular streaming subscriptions get hundreds of poisoned ads put in..and in the minutes it takes for them to find those ads and remove them, too late..thousands of end users computers already saw them..and got exploited by old flash or java or pdf readers.
BTW, many porn sites are safe, my wife hits some several days a week, and we've been together over 7 years, I haven't had to disinfect a computer of hers yet. Her step brother is in that business, she was taught the safe ones.
*I travel places with my laptop. Being in IT, you're surely aware that lots of malware is capable of traveling across LANs...hopping across computers on a network. So if my computer is clean, and your computer is infected..and I put my computer on the same network as your computer...my computer is at risk, it's exposed. Now..this question is moot if you're talking about your home computer, but I'd say over 90% of my "time on a keyboard" is spent on my laptop, traveling from client to client to client to client (onsites)...and using public wifi, AmTrak wifi, airports wifi, internet cafe wifi.
*Dont' forget...the "good malware" goes undetected. Only the poorly written malware lets itself be known.