Ok ... this thread is especially for Nekys, i think he's the one that can help me the most, but if u know how to solve this problem, feel free to post.
When i try to connect from other pc, a friend of mine, i get this error :

Warning ! Some game files are corrupted or not found !
This can be caused by the antivirus software bla bla bla ... it tells me to stop the antivirus and try again.
If this is not working, reinstall the game and update it ....

Well i've done all they say. turned off his firewall, his antivirus software, reinstalled the game, update the game, original hosts ... all that and still not working !
i use the l2.exe inside the infernopvp folder

my friend ... i can play xD

i haven't fixed it ... my friend still can't play