Nice bug

Yesterday i was playing a ranked,the game just started and I decide to put the verticalsync off on the option menu, when i press the ok button the game freeze, i tried to alt+tab , ctrl+alt+canc or alt+f4 but nothing, i needed to restart my computer,after that i tried to reconnect but the game freezez at 100% on the loading screen,i couldn't get into the game and i need to restart my pc again;at this point i decided to unistall and reinstall lol, so this morning i tried to get again in a normal game,but i have the sameproble and all is freezed at 100% in the loading screen :(. Can someone help me?
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