League won't launch.

So I've been playing this game for two years now and just recently this started happening. I open the client but i'm not able to launch the program. After I hit launch the button turns gray and I cannot click it. I've tried uninstalling and reinstalling, turning off my firewall, repairing the files, resetting my computer (multiple times), running as administrator and testing the compatibility. Nothing works. This is not the first time this has happened but this is the worst, if you have the same problem or a solution please feel free to contact me.