My leauge of legends keeps crashing after i log in

Please help me after i open my client and enter my user and password when it loads every thing and L.O.L client start runing after a cople of seconds of using it i cant press any thing and it crashes im runing a win 8.1 32 bit and this is the first time this happend and i dont know how to fix it tried every thing but i cant find a solution my curent version is 6.18 and it happend during he first update of the 6.18 please if you have a way of fixing it il try any thing so please and thank you in advanced.