I just had it pop up on my screen.
The only way i could close it was by pressing CTRL/ALT/DELETE
{opens Windows task manager}
and closing my browser by highlighting it { I was using Firefox} then pressing the End Process button.
I opened Firefox and it asked if I wanted to restore session or start a new one - I selected new one - so the AV 2009 would not pop back up again.
info-
Antivirus 2009 removal - if you accidentally click on it and it installs...
http://www.google.com/search?hl=en&c...al&btnG=Search