Help! I can't get into games!

I go into a league match, and I get a popup. I'm thinking hmm....I look up fixes upon fixes in the next 20 minutes, to no avail. I really hope I don't get banned for AFK, because I don't even know what this error thing is. Something about an unknown error has occured with my shaders? And it says to update my driver. Just updated it, still crashing...Help!?