i cant get in a game after champ select and i have to reinstall everytime i open my pc

So , i just got a new pc and i installed lol and all went well, but when i closed my pc and reopened it later after champ select my games wasnt responding and the games icon didnt show in the task bar . so everytime i open my pc i have to reinstall the game. i searched on the internet and no results . i hope someone can help me with this problem
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