Serves those PC owners right for straying from the almighty Apple. If they stuck with Apple, they couldn't get infected with a Windows Virus (unless, of course, they run Windows in Bootcamp because, you know, they actually want to do something with their computer).
Anyway, NEVER trust hacking websites, EVER! Seriously, these people have no problem circumventing the law for their own purposes, so why wouldn't they install a virus on your machine? Think about it people!