Dll file

My esf says i have a different dll file from the servers. Ive had this problem for awhile and its getting me very annoyed. I know what the dll file is but why the hell would it be different. i need someone to tell me what the hell is going on and how to fix it. thanks a bunch

I apologize. i know that there are like a million of these but ive done what each one of them has said and they all still don't work. I had no problem with alpha and it just happens with beta. Im sorry again but i really want to get playing again

arrg now another problem. it says not that it can't load library client cll file. I really do hate my computer