Problem to initiate games

Hi,

I made a system recovery yesterday, and I cannot play games now. I can enter the client, queue and join the lobby, but when game starts, I can't join the load screen. There was a message shown asking for a .dll.

1. I closed the client, and made a "Full repair". It didn't work, same message spawned
2. I downloaded the file and placed it in the folder. This time no files were missing, just a simple message "unable to conect blabla"
3. I installed again LOL. I tried to uninstall it at first, but I couldn't cause league of legends wasn't displayed in the windows "uninstall" screen (idk why ¿?¿?). So I installed it again. Patched. Tried to join a game, it doesn't start. No messages spawn this time, but every time I click in "reconnect" nothing happens....

What can I do guys? I'm totally lost :s

https://s33.postimg.cc/rshgfjr33/image.png

Thanks.