Sometimes at home (and never at work) I get the "blip" noise and then the little bar across the top saying it's trying to install "Outlook.exe" (which is my email program anyway). Says "click here to download if you trust this source, etc..." I never do, of course, and eventually can navigate around AA. I'm running McAfee (which I actually hate) and Black Soul in IE 7.
So far, it's only a very tiny annoyance...
1 yoyo loach, 2 polkadot loaches, 6 cherry barbs, 2 turquoise rainbows, 1 chinese algae eater, 2 harlequin rasboras; java fern, java moss, hornwort, Asian ambulia