CLient Crash every i die in Colosseum

i try to reinstall my flyff client to fix this problem but nothing happen. i do this twice. then i reformat  my PC but nothing happen too. if my fd  slayer died or my fd seraph in colosseum my client always crash. Anyone help me to fix this?

are you on a dual window? try one only. sorry but i think your computer cant handle it

Take a look at the system requirements for the game here. This may give an answer to the problem.

My COmputer is Quadcore i can open 5 windows. i try one window in colo its the same. if im die automatic my client crash