This error is notorious on PC (especially on Windows 10 and 11) because the game was poorly ported and tries to write save files to a protected system folder. It also plagues players trying to use the Radnet DLC.
Navigate to your Prototype 2 installation folder (usually located under C:\Program Files (x86)\Steam\steamapps\common\Prototype 2 ). prototype 2 failed to save data fix exclusive
If your game runs at an unplayable 10–15 FPS despite having a high-end graphics card, the engine is choking on modern USB device detection. This error is notorious on PC (especially on
If the game save file is corrupted, deleting it might resolve the issue: deleting it might resolve the issue: