Never ALT+F4 or turn off your system while the game displays the saving graphic.
Shutdowns while the game was saving (e.g., power outage, console crashing).
After you've fixed your save, you'll want to prevent this from happening again. Here are some final recommendations to keep your PES 2013 progress safe:
Usually, the main "SaveData" file becomes unusable, but a backup might still be intact, or simply removing the corrupted file allows the game to create a fresh, working one.
"Load failed. Save data is corrupted."
The "PES 2013 Multiconverter" is a staple tool for the community. It is often used to convert saves between platforms (e.g., PS3 to PC), but its "repair" function is invaluable. It can re-encrypt a decrypted save, making it readable again if the header became corrupted.
Look for an offset block filled entirely with zeros where data should be, or look for unexpected characters.