Here are the steps to fix a corrupted file:

1. Check the file’s integrity by running a virus scan.
2. If the virus scan result indicates that the file is corrupted, deploy a backup version of the file.
3. Make sure the backup file is not infected and that it matches the original file.
4. Repair or replace the corrupted file as necessary.
5. Lastly, auditing the file system to identify the cause of the corruption.