incompatibity with 64-bit versions of windows

Hello, So i was just playing league and somehow after restarting my pc because of harddrive problem (making clicking noise) i tried to open the game and an error box pop out it says 'cannot start or run due to incompatibity with 64-bit versions of windows. please contact the software vendor to ask if a 64-bit windows compatible version is available' i used the hextech repair tool and the tried to repair from the admin launcher and even reinstall it and nothing changes, Please help.
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