Morph we have a location!
OK, now all we need is a name, and after we get his name, I can find his address pretty damn fast. And after that, we can finally go to his house/apartment and beat the hell out of this pervert!

ok to clear it up there is no way he could of done something to sis he lives in denmark and they where talkin on PW which as far as i know chat cant be cleared an she always wants on just to talk to him i figured if he was harming her she wouldnt want to see him
LIES! LIES I tell you!
She is too afraid to tell or show you the truth. Maybe he is threatening her, that if she talks he's gonna hurt her or her family. And I am sure there's a way of clearing the chat log, but the easy way is to just quit and re-log into the game again.

Seriously, you better hope he is just some pervy-stalker guy, because like Altaux said, he might be a pedophile with homicide tendencies.
(Sorry Altaux, I didnt steal your pic, I just reposted it, so Skidi can get my point.)
And of course I fully agree with Altaux 
Alright, I know its hard to get the real name of someone over some MMO, that only shows his alias, but I think its doable. If we get his nickname in PW, maybe I can hack into the PWI servers, and find out his real name over credit card charge for ZEN, or simply by his profile, which normally you cannot see from the game.
My team is almost ready to strike, I only have to give the word to them, but in order to do that, I need to first have accurately his location.
DONT worry Skidi! Me, Shiro and Altaux, will save your sister from this disgusting, pedophile, perverted, fat, HIV carrier, sick old man!!!
We are getting closer and closer to get him by the minute, just give us his nickname in PW.
"Can I haz cookies nao?"