**BEGIN PUBLIC SERVICE ANNOUNCEMENT**
Please don't rely on Anti-Virus software to keep you safe from these types of problems. AV software is not effective at preventing things like this. You've probably heard about the NYT getting hacked a couple weeks ago by the Chinese. The NYT had up-to-date anti-virus on every endpoint that was compromised. The AV software missed 44 of the 45 malicious payloads used by the attackers. Greg Davis is more effective at 3rd down conversions than AV is at picking up new viruses. It's great at finding last year's viruses, but they're always behind the times and should never be your first line of defense.
Disable the extensions you don't need in your browser, or at least force Chrome to prompt you before launching them: java, flash, shockwave, etc. These are common infection vectors, and you probably don't need them for daily browsing. And when you do need them, you can enable them on an as-needed basis in Chrome.
If anybody wants help setting up their browser to prompt them, I can post instructions here or you can PM me.
Stay safe out there.
**END PUBLIC SERVICE ANNOUNCEMENT**
EDIT: I'm not saying you shouldn't run AV, I'm just saying don't rely on it as your only line of defense.