: Press the Windows Key, type Windows Security , and press Enter.
Either turn it off (not recommended for long-term) or click . Add prototype2.exe to the allowed list. 3. Clear Corrupt Profile Data
Similar to, but separate from the saving issue, if the game crashes at the splash screen, you may need to use a batch file to limit the game to 4 or 8 CPU cores. prototype 2 failed to save data fix exclusive
Concrete code sketch (pseudo / conceptual)
If there is a save_data or slot folder, delete it or rename it to save_data_old . Launch the Game: Start Prototype 2 as Administrator. Create New Game: Allow it to create a new save slot. : Press the Windows Key, type Windows Security
The most common cause is that the game doesn't have the proper permissions to write to the save folder. Perform the following steps:
Summary
If the standard permission fixes fail, creating a fresh local Windows account often resolves deep-seated permission conflicts that prevent saving. :
Windows Ransomware Protection often flags older games as unauthorized applications, preventing them from editing the Documents folder. Launch the Game: Start Prototype 2 as Administrator
: Press Win + R , type msconfig , and hit Enter.
By following these steps, you should be able to permanently fix the "Failed to Save Data" error in Prototype 2 and continue playing as Mercer.