Dead by Daylight Easy Anti-Cheat Launch Error 00000001 & Untrusted System File Fix
Easy Anti-Cheat Launch Error 00000001 or 'Untrusted System File' in Dead by Daylight triggers when EasyAntiCheat_EOS.sys cannot establish its kernel-level integrity verification, often due to modified system DLLs, antivirus quarantine, or corrupted EAC certificate stores.
- ▸Run EasyAntiCheat_EOS_Setup.exe as administrator and select Repair Service
- ▸Execute Windows SFC scan and DISM health restore in Command Prompt
- ▸Delete EasyAntiCheat_EOS.sys from C:\Program Files (x86)\EasyAntiCheat_EOS and verify via Steam
Step-by-Step Resolution Steps
Click steps to track progressRepair Easy Anti-Cheat Service via Steam Common Directory
Navigate to steamapps\common\Dead by Daylight\EasyAntiCheat → Right-click 'EasyAntiCheat_EOS_Setup.exe' → Run as Administrator → Click 'Repair Service' → Finish.
Run System File Checker (SFC) Scan (CMD)
Open Command Prompt as Administrator and scan Windows protected system files for corrupt or untrusted DLLs flagged by Easy Anti-Cheat.
sfc /scannowPurge Stale EAC Certificate Drivers (CMD)
Close Steam completely. Open Command Prompt as Administrator and remove the temporary EAC driver cache so a pristine driver is reinstalled on launch.
del /f /q "C:\Program Files (x86)\EasyAntiCheat_EOS\EasyAntiCheat_EOS.sys"Did these steps resolve your error?
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Cat 8 Shielded Gigabit Gaming Ethernet Cable
Eliminate packet drops and heartbeat disconnects between EAC and Dead by Daylight game servers.
Why Does This Error Happen?
Understanding the root cause prevents recurrence during competitive matches:
- 1Corrupted EasyAntiCheat_EOS service runtime located in the Dead by Daylight installation folder
- 2Windows system file corruption in d3d11.dll, dxgi.dll, or uxtheme.dll flagged as 'Untrusted'
- 3Antivirus software (Bitdefender, Kaspersky, Windows Defender) locking EAC driver communication
- 4Stale certificates or out-of-date Windows root security certificates
Frequently Asked Questions (EAC Error 00000001 / Untrusted File)
What does 'Untrusted System File' mean?
It means a DLL loaded by Dead by Daylight (such as a DirectX hook or reshade file) failed Easy Anti-Cheat's cryptographic signature check. If you have custom ReShade or FPS unlockers installed, they must be removed.