Firefox, AdBlock Plus, and Microsoft Security Essentials running here and I haven't even seen MSE try to pick anything off. I know it's not helpful to the site to run an ad blocker, but cases like this are the exact reason I do.
Also, to anyone that's been hit by this - go update EVERYTHING on your system that can be updated after you get things sorted out. Flash, Java, any Windows updates you may not have yet...do it all, and *keep it up to date*. If you're not sure exactly how to do that, look into Secunia Personal Software Inspector. It's free, legit, and will keep you on top of new updates for virtually anything you have installed.