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Does the computer equivalent of HIV/AIDS exist?
And I don't means the virus named AIDS, described here:

http://en.wikipedia.org/wiki/AIDS_(computer_virus)

What I refer to is a virus that does to computers what HIV/AIDS does to us.

An explanation of HIV from Answers.com:

http://www.answers.com/HIV

Would such a virus be practical, if it's even possible? Or does it already exist?