Hey! I've had this problem too recently. The "problematic file" that's causing this is "r5apex.exe.local", under Origin Games/Apex. When you try to delete it, Windows complains that it's "corrupted", even though it's 0 bytes in size.
How I've fixed this without reinstalling:
• Have Origin completely closed
• Enable hidden files in the Explorer: File -> Change folder and search options -> View tab -> Hidden files and folders -> Select "Show hidden files, folders, and drives"
• Locate your Apex Legends folder:
- if on the same disk as Windows: C:\Program Files (x86)\Origin Games\Apex
- if on a separate disk: disk:\Origin Games\Apex
• Make a folder somewhere else, and remember its location. I made a folder in my Desktop and called it "ApexCopy".
• In the main Origin Games\Apex folder, select everything EXCEPT "r5apex.exe.local" (Ctrl + A, then Ctrl + Click on the .local file), then move the files over to "ApexCopy"
• Delete the empty Origin Games\Apex folder completely
• Make a new "Apex" folder inside Origin Games
• Move every file from ApexCopy inside the "Apex" folder you just made
• You can now play!
• Optionally try repairing the game if it doesn't work first try
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