Trojan comes full circle

Back when I was a smallish-type child, there was a book in my local library that showed a picture of a big wooden horse on wheels, and then in a little side picture, it showed that the horse was full of men, waiting to sac a kingdom once it was pulled inside the castle gates. It was a trick, the trojan horse. It was bad and you didn't want it.
Then, when I was a lot older, trojan meant something totally different. It meant protection, and you definitely wanted it. The trojan was good and it worked. Trojan was your friend.
Now, a few weeks ago, I got a little window on my virus scanner that said it had detected a trojan. This trojan is bad, you don't want it. End of internet, end of word, end of e-mail, myspace, blogger, facebook, msn. Beginning of major headaches, worry (Who has been reading my bank statements? How will I know if my identity has been stolen before someone buys a yacht in my name?) irritation, frustration. This trojan is a real pain in the patella, and I don't say that lightly. Trojan is bad again.