Copy your existing 54 folder to a safe location before making changes.
Corrupted saves are often caused by the game being closed abruptly or by antivirus software interfering with the crack files. Adding your game folder to the Windows Security Exclusions list can prevent this. Save Game Assassins Creed 3 Skidrow Crack
If your still isn't working, run through this checklist: Copy your existing 54 folder to a safe