just when game starts, my computer crashes

just when i get in to a game, my computer crashes. i can't even get up the shop or move before it happens. i need to restart the computer to make it work, and as the computer takes it time to restart, i wont make it back in to the game before the enemy champ in my lane is lvl 2+. sometimes this crash can come in the middle of a game to, and it has been like this the last month atleast. Please fix it so i can play again without my team blaming me. Here you get a poro,