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and although I appreciate the advice, I already know that they can find out and don't really need insight on that aspect of my original situation becauseI can take precautions to avoid that or prepare myself to take the beating in a fashionable manner
Among my many bad habits, I am paid to teach ethics and do it in public. I would suggest that you do need insight on "that aspect of [your] original situation." WoW is unlikely to be the most private thing you will ever want to put on your computer. Forget all the talk about law or the rights of parents vs. the rights of their children as they approach majority. Instead, think about it as an ethics issue. Ethics fill in the blank spaces where law is unclear, they provide a kind of invisible line or unspoken truce in many situations. Once that line is crossed, or truce broken, it is hard to restore the status quo.
In terms relevant to your situation -- if you go using things like key loggers against your parents, you invite them to ratchet things up. The next thing you know they wonder what *else* you have on your computer. I recall a couple of posters here have worked in info management. You might post back to them and find out just how invasive someone can be if they can 1) directly access your computer, and 2) are using default Windows settings. Take a moment and imagine them reading every email you get, checking out every site you surf, checking your search requests. When they do, and I would say that if you use a key logger it is rather likely that they will, you are the one who broke truce first. You will be trying to argue your rights from a position of rather extreme weakness.
Note -- Although you consider your parents to have broken truce first by (in your view) ninja-ing your account, so far they haven't moved to their own key loggers and such. Your choices can move them into a competition that you are unlikely to win. It sounds like you've already crossed the line, but you can mitigate the damage by not using the information you've gathered to make more of a confrontation.
By the way, do remember that the confrontation won't end with WoW or your computer. You are going to need things like parental consent forms for another couple of years. Imagine those forms and waivers not getting signed, you'll still get into college without ski team or the other sports, you just won't have as much fun getting there.