League f***** up my computer

I was in a ranked game and then my computers resolution went all weird and went out of proportion without me touching anything, and them my fps stayed at 02 and then i quit and start the client again, but noticed my overall resolution is all wonky and i tried everything for 4 hours to try to fix it and then nothing happened. so i had to uninstall league, run tests on my computer and nothing is popping up. its still really wonky and i dont know why but i am blaming league of legends client for this issue which is very very stupid. the computer i have runs perfectly fine until today, where i launch and try to play a game and it f**** up on me and my mom. like wtf