Problems with loading screen

Recently whenever i start a game even a custom game after champ select is done instead of the loading screen popping up i get a System error that says that a critical error has occurred and the process must be terminated. I have tried uninstalling and reinstalling league of legends but now i am starting to think this has something to do with my computer. Can someone pls help me
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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