Entry point BUG

I had few problems with my hardisck, but now there'll solved. I open LoL, then go to play..bla bla.. pick champion, and then when it should go for the screen game, an error appears everytime I try to play.

It says like this: " The procedure entry point packman could not be located in the dynamic link library C:\Riot Games\League of Legends\RADS\solutions\lol_game_client_sln\releases\0.0.1.243\deploy\League of Legends.exe. "

I don't understand, please help me. Thanks. [sg-zephyr]