LoL Repair,Corupted file

Can someone tell me how can i fix this issue.I turned on my comp,entered league and window popped saying all league ... files are corrupted.I stared at it like an autist for 10 minutes,didnt understand it,lol.However,can someone help me solve this.All league files are corrupted(dont know what does that even means),when i enter league its saying repairing,lats for like half an hour and says repairing failed...I tried uninstalling and instaling and nothing(RADS file cant be deleted :( ) What do i do?