The authors of the worm have a structural advantage over the antivirus companies, which is that the antivirus companies have to sell their product to people. So, the virus writers can always just get a copy of the antivirus software, and test it out first. And, worms spread so quickly that millions of machines can get compromised before the first updates come out.

And not just the quicklaunch, but you can make any number of toolbars with any number of things on it, and put it on any part of the screen.