Code 4 X360ce 2021 - Self Protection Failed Error

Understanding and Resolving "Self Protection Failed: Error Code 4"

Antivirus Interference: Modern antivirus software operates using "Heuristic Analysis," looking for programs that behave like malware. Hooking into a process (which x360ce does) is a classic behavior of malware such as keyloggers. Consequently, Windows Defender and third-party antivirus suites began aggressively blocking x360ce from writing to the memory of the game executable. When blocked, the emulator interpreted this failure as a memory violation, triggering the self-protection error.
Software Conflicts: The rise of other gaming overlays—such as Discord Overlay, NVIDIA GeForce Experience, and Steam Overlay—created a crowded memory environment. These overlays also hook into games to display interfaces. If two different pieces of software attempted to hook the same memory address simultaneously, x360ce would detect a conflict and halt with Error Code 4 to prevent a system crash.
Version Fragmentation: In 2021, users often mixed and matched files. A common mistake was using an older xinput1_3.dll file with a newer configuration executable, or vice versa. This version mismatch meant the configuration file expected memory structures that the DLL file could not provide, leading to a protection failure.

Quick Summary

"Fix 1"

If you are still stuck, remember: The x360ce community forums and Reddit (r/x360ce) are active. When asking for help, mention that you have already tried the (Controlled Folder Access) – that will save everyone time. self protection failed error code 4 x360ce 2021

Error code 4 often means your antivirus (especially Windows Defender) is blocking x360ce from writing or injecting files.
Turn off Real-time protection (Settings → Privacy & Security → Virus & threat protection → Manage settings).
Add the entire x360ce folder to the Exclusions list before re-enabling.

For Windows 10/11:

Game-Specific Interactions

: Some games with their own anti-cheat or online-fix modules (e.g., Forza Horizon 5 , Elden Ring ) clash with x360ce's attempt to hook into the game. Verified Fixes for x360ce (2021-2026) 1. Run as Administrator Quick Summary "Fix 1" If you are still

Hope this saves someone else the headache. Let me know if you found another fix. Forza Horizon 5