Launcher Won't Appear

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Hello, I recently got my computer fixed and tried to go on LoL but it didn't work. All I saw was the logo for about 1 second and then it disappears but the launcher (the one with play) never appears. I ran as administrator and it still didn't work. I reinstalled everything and it still didn't work. I used the troubleshoot compatibility and at the end of it, it says Incompatible Application. Also, I replaced the rads_user_kernel file with one this guy on the forums said to do and apparently it helped a lot of people but it didn't do anything for me. Can someone please help?