Originally Posted by Shocktar

I disagree. I'm an IT professional (and GM), and it happened to me. I had the full on AVG antivirus, a computer that I play on that I *never* surf the web on, password changes every month, and I still got keylogged. As it turns out, it was from UI Central, an updater that I'd been using for a year with no issues whatsoever, when all of a sudden one of the ads had an embedded worm.
Fortunately, I found it after a night's worth of Google, but it's still very very possible. It went right through all my security measures instantly, despite the fact that I never do ANYTHING on that machine but play wow and 2142, and I still use tons of protection.