League client wont open

After updating the new client I cannot even get into the login menu for league of legends. When looking in task manager when I click on leagueclient.exe, one instance of league client pops up along with riotclientservice.exe howver, both of these close on itself after about 5 seconds. I know this is the new client causing this issue as my temporary fix so far is to reinstall the game everytime I want to play it. I have tried the repair tool, adding firewall exceptions, updating drivers but nothing changes. Can you please look into a fix for this as currently it is very offputting to play league if im gonna have to wait 20-30 each time for an install.
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