Well, sorry to say, it IS your fault. You either got keylogged, phished, were on shady sites you thought were trust worthy or countless other methods. Having a new computer and a anti-virus program means nothing when your activities are causing it.
I constantly see links posted, to videos, guides, items, selling sites, etc. You got yourself hacked, not Blizz.
Lrn2protect your own computer tard.
What advice would you give to those of us who are not, as you seem to assume, completely new to using a computer? I have never clicked any links from this forum or any other forum regarding Diablo 3 that weren't from a reliable source or a google search for "act 1 farming spot" or something. If everyone who did exactly what I did got hacked, we'd be seeing probably hundreds of thousands more complaints. Besides, even if they did get a keylogger on my computer without me knowing, why would they give a !@#$ about Diablo 3? Why not just go straight to my bank account?
The argument "you got yourself hacked" doesn't really make sense when I haven't done anything that would get me hacked. And yes, I have already added an authenticator, changed password and contacted Blizzard.
Bank account is a felony - digital item theft in almost every jurisdiction is not even a misdemeanor. (although I did see some articles last year about some legislations considering upping the charges for such - but right now, even if you could ID the thief in most cases, they're up for compromising your account only - a teensy misdemeanor - and it's not easy to identify them)
And there's numerous ways to get hacked some of which are hard to clear off once they've happened - personally, I when I first put this machine together rather than calling MS to move my old Win7 license to my new machine downloaded a crack for Windows 7 so I could unlock my DVD installed copy without having to go through a 30 min phone call.
Ends up being that put a trojan on my machine - one that was so well on there that no virus scanner I ever ran caught it (although it would catch other things it tossed on my machine on occasion - but never the root) - even hijack this delving over my entire registry by hand I couldn't find anything.
That stupid trojan cost me my WoW account.
Now with my D3 account I took every precaution I could, and from what their email support has told me I've had no attempts at a login from an IP that doesn't match my home to date - but even then, I'm far more comfortable with my account security with the $6.50 autheticator sitting on my keychain. Even if some weird IP does eventually get my login because of another error I make, I know I'm covered regardless.
And of course the wife uses one too - but hers is free, since we've got one Android phone. (waiting on the contract renewal to get the second cheap before I join the smartphone world)