UNSUPPORTED 16 BIT

I wanted to play LOL today and after champ select normally there would be a loading screen right? Well a notification popped out saying Unsupported 16 bit. I think thats what it said. I dont know how to fix it and i really need help with it. PLS RIOT answer this because i really dont know what to do and anohter problem i have is that i downloaded patch update friday and it said download it again on tuesday. I had to unistall and reinstall due to that it wouldnt download. After reinstalling i had to wait till it was 100% so I could play but it said unsupported 16 bit. I have a lots of problem with this and i really do wanna play some lol matches but what can i do. Please help me.