LeagueClient.exe - Bad Image

As of yesterday, whenever I attempt to open my League client I get a message called LeagueClient.exe - Bad Image telling me that there is an error in the program and that I should reinstall it. So I uninstalled League and when I attempted to download it again, I got the same message as soon as I clicked the "Launch" button. I played several games just the day before this started happening. I'm on Windows 10