Although stupidity is normal, you should try to live by one simple rule: don’t download software. Just don’t. And if you really must, only install if it comes recommended by at least one trusted source such as a computer-literate friend or a high-profile tech website. But don’t download software because a flashing red text on some obscure website tells you your computer is “infected”. Don’t “install a new version of Flash Player” to see that free porn movie. Don’t download, don’t install. Don’t!
So, to summarize; don’t install software and install Noscript and all will (probably) be well.