If you are having trouble opening the launcher, constant bugs in the game or technical problems, no need to reinstall the game, do not need to disable antivirus, no need to update Adobe AIR. I've had several times problems in my home, and I decided simply by the rapid backup in league of legends. To do this, simply: 1) Go to the folder of the league of legends, usually: [C: \ Riot Games \ League of Legends \ RADS \ projects] 2) Rename the "lol_launcher" folder to "lol_launcher_backup" 3) Rename the "lol_air_client" folder to "lol_air_client_backup" 4) open the launcher in administrator mode. the end of the process, the launcher will download some files that have been deleted in the backup, but it is a quick process, and most of the time the problem is solved If you've done this process and have not solved your problem, please contact me I will help you with other good methods that always work Big hug.