What do you call a program that gets loaded in surreptitiously and without your approval, has the potential to lock down your computer so you can’t get access to it, takes up significant system resources and promptly crashes upon running. Normally, I’d call it a virus, except for the last part … viruses are usually stable (and well written) once they start. On the other hand, it’s a perfect description of Internet Explorer 7.0.
O’Reilly XML Blog: The Difference Between IE7 and a Virus