I once got a strange virus from a Flash Player Update popup.
It was kind of strange
Half of it was the google re-direct virus (When you click on a link on google, it re-directs you to a different unrelated site)
The other half was wierd, i kept hearing what seemed like radio broadcasts, and i think it might have been MSN, but i wasnt too sure, i just remember hearing people talking about celebreties and other stuff i dont care about. I downloaded 4 different things to try to get rid of it, and none of them worked, it just came back. Couldn't track it down. I ended up wiping my hardrive.