Certainly nothing is wrong with using that avatar. I was just pointing out how certain types frequently do use it (and not by specific choice, of course).
As for evidence, the switch from "if i have a copy of xp" and "i have been running on it for about 5 months now" to "its not my computer" and "i dont know if he paid for it or not" is odd. Of course it could very well be true, but if it were me, I would have made a bit of a speech about "I know it looks suspicious, but I honestly don't know where the disc came from. I am not trying to pirate".