Cannot go into any games. Pls help!

I'll keep it short. Earlier today I tried to go into a blind pick game after playing some ranked. However as soon as I accepted the invite, the champ select stayed black for a second before flashing the normal screen(picking a champion) and then closing the window. Nothing League related was open after this but when launching it again I had to terminate the existing version. It was also shown when I looked in background activities in Task Manager. I tested this out again in custom games, all with the same result. I also tested on a different account with again the same outcome. This effectively means that I cannot go into champ select, and cannot play games. :( :( :( I don't know what to do, if anyone has any fixes or ideas they would be greatly appreciated Thanks in advance {{summoner:2}} {{summoner:17}}