I'll take this one
Let's say I have Win 95 and I install RealPlayer. I then download an Internet Explorer update. (Since MS testified under oath that it is part of the OS, this is fair game.) RealPlayer no longer works.
So their software, without my approval or consent, silently disabled other software that I installed. And there is no way of determining in advance that this will happen, nor any reliable way of preventing it.
It did damage my software.
I discover the problem, and try to uninstall the "update". It doesn't uninstall cleanly and I go to support.microsoft.com to figure out how to fix it. While there, the (silently installed) update agent sees that I don't have the latest version of something. It silently re-installs the update.
It did replicate itself.
Sounds viral to me.
We have to fight the terrorists as if there were no rules and preserve our open society as if there were no terrorists. -- [link|http://www.nytimes.com/2001/04/05/opinion/BIO-FRIEDMAN.html|Thomas Friedman]