Prototype 2 was designed for older hardware and often fails to handle modern CPUs with high core counts (typically more than 4 or 8 cores), leading to crashes and save corruption. Launch the game.
Delete the Prototype 2 folder entirely (backup existing saves first). prototype 2 failed to save data fix exclusive
If you are experiencing any right before the error appears. Prototype 2 was designed for older hardware and
Windows Security has a feature called "Controlled Folder Access" that prevents apps from modifying your Documents folder—which is exactly where Prototype 2 tries to save. Search for in your Start menu. Go to Virus & threat protection > Manage settings . If you are experiencing any right before the error appears
Select Prototype2.exe (or prototypef.exe depending on your version).
Unlike the first game’s Alex Mercer, this bug doesn't wear a hoodie—it hides in Windows permissions. And the "Verify Integrity of Game Files" trick? That’s for amateurs. Here is the fix that actually works (and no, you don't need to disable your antivirus).