Frozen Screen

Hey, I have big problem with playing league of legends. When I play, in every single match my screen just froze and not responding. I can't do nothing more than just restart my computer. I can't play because of this weird crash. I have windows 10 and I tried reinstall league of legends ( and yes, I deleted all files). I tried hextech repair guide and now I dont know how to fix it. PLEASE HELP. [sg-janna]