First step: delete the game
Second step: go with cmd to regedit and delite all registery from AL
Third step: restart pc
Finish
ready to install the GAME
i think u was using pserver files on your pc
if u change files from the webzen client to p-server-client and start game so your webzen client fail
(same as ip-ban
)
do the 3 steps and finish
so you can play again
good luck
and have fun