Installer behaving weird/not working

I am having some big problems with my lol installer. What happens is that the installer installs the game then i click in the start after game installation checkbox but when the game "starts" it never pops up and it just sits there in the task manager until it quits itself after 30 sec. Then when i try to start lol from the desktop shortcut or game folder it repairs the game. When the reperation is done it just sits there in the task manager when trying to start the game. I have never had this problem before and it's very frustrating, please help. I have tried installing different region installers and reinstalling multiple times.
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