how do u get from korean to english? in game?

Whenever I try to install L2 Beta I can get to the extracting the file to the temp directory, and then when it finishes a notice pops up ( I think it says like extraction complete) then another note pops up with the name Installshield at the top, but when I click it to install it deletes the files in the temp directory and the installation window closes itself and then it does nothing.