Unable to play league of legends at all.

Hello, since yesterday i keep getting the error '' PVP.net Patcher Kernel '' has stopped working. now i tried everything to get this working. but with no succes. and now i tried to do a clean installation but i cant even remove it. when i try to remove it it ask for the path for '' LoL.EUW.msi '' but it is nowhere to be found. i even added the file ''LoL.EUW.msi '' to my anti virus as a ''virus'' but it also doesnt find it. i have no clue what to do now. Regards, NegativeA EDIT : so i re downloaded a installer and now it gives me the message, '' The older version of League of Legends cannot be removed. Contact your technical support group.
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