Need help asap please!!!!!

I have downloaded and re downloaded many times, but still nothing, Every time I go to start up the game it starts to load to a black screen and then a white message box apeers and says (Client File corruption detected, closing game client..... Need help please and dont just say redownload it, I am getting tired of reading that as a solution all the time, if it didnt work the frist time why keep trying that method. Give me something that works for once please!!