Dead by Daylight crashing or won’t launch on PC? EAC launch error, security violation, verify files: Behaviour’s official fixes (November 2026)

Dead by Daylight crashes to desktop, closes during a match or loading screen, or refuses to start on PC with an Easy Anti-Cheat (EAC) “launch error”? Behaviour Interactive keeps an official support page acknowledging frequent crashes, a dedicated page for the EAC launch error that appeared in July 2026, and a master fix guide for PC. Here are their steps, in a sensible order, as read on November 11, 2026. TricknFix did not test these steps itself: they are Behaviour’s instructions, not a guarantee.

1. First: a known issue, and are you on the latest patch?

• Behaviour’s “Game Crashing” support page, created August 28, 2026 and still online on November 11, 2026, says: “We're aware of the current frequent crashes for players and are working on fixing the problem.” So some crashes are on Behaviour’s side and not on your PC.

• Patch 10.2.2 (Bugfix Patch, October 20, 2026) lists two crash fixes: a crash “during map generation under rare conditions” and a crash “during loading on some platforms”. Patch 10.2.1 (October 14) fixed a crash in trials with The Wraith, and 10.2.0 (October 6) a crash during a match. The latest note we found on Steam is the 10.2.2b Backend Patch of November 9, 2026.

• Let Steam, the Epic Games Store or the Xbox app install the latest update before trying anything else.

2. “Launch error” from Easy Anti-Cheat naming a driver or program

• Behaviour says this error, seen since July 2026, is “likely due to” a security update to its anti-cheat. The message names an outdated program or driver that you must update.

• The categories Behaviour lists: RGB or motherboard utilities, CPU/GPU overclocking or tuning tools, certain BIOS utilities, hardware monitoring tools, utilities using direct port access, manufacturer updaters (Dell, Asus, Lenovo, etc.) and other anti-cheat, anti-hack or antivirus software.

• Search for the exact driver name shown in the message, then update that software from its maker’s site. If a new launch error appears after updating, Behaviour says another incompatible program is probably present: update the next one it flags.

• Behaviour adds that this is not a Secure Boot requirement, that it does not change the minimum specs, and that Linux and Steam Deck players have nothing to do.

3. “Game Security Violation Detected”

• Behaviour says this message often appears when software controlling RGB lighting (fans, RAM sticks) conflicts with EAC. You will not be able to play until that software is disabled.

4. “EasyAntiCheat (EAC) Driver Enforcement Error”

• This means Windows Driver Signature Enforcement may be disabled. Behaviour’s fix: open a Command Prompt and run, one at a time, bcdedit.exe -set TESTSIGNING OFF then bcdedit.exe -set NOINTEGRITYCHECKS OFF, and restart your PC. (In practice, these commands need a Command Prompt run as administrator.)

5. “Untrusted System File”

• Behaviour says some Windows system files may be corrupted. Make sure your copy of Windows is genuine and up to date; if you use a Windows Insider or Preview build, consider going back to a public build.

• Then open a Command Prompt as administrator and run sfc /scannow, and let it finish. Behaviour warns that if this does not work, you may need to reinstall Windows.

6. Crashes, error codes or poor performance: Behaviour’s master fix guide (PC)

• Check the minimum requirements: Windows 10 64-bit, Intel Core i3-4170 or AMD FX-8120, 8 GB of RAM, a DirectX 11 card such as a GeForce GTX 460 1 GB or AMD HD 6850 1 GB, and 50 GB of storage. Behaviour calls 64-bit Windows 10, a DirectX 11 GPU and the latest drivers and updates “absolute requirements”.

• Check your internet connection (Behaviour has a network troubleshooting page).

• Update your audio and video drivers, DirectX and Windows.

• Verify the game files. Steam: right-click Dead by Daylight, Properties, Installed Files (Local Files), Verify integrity of game files. Epic Games Store: Library, the “...” under the game, Verify. Microsoft Store/Xbox app: My Library, Dead by Daylight, “...”, Manage, Files, Verify and repair.

• Perform a clean boot of Windows to rule out background programs.

• Finally, reinstall Dead by Daylight.

7. Denuvo Anti-Cheat leftovers after the test

• Dead by Daylight ran a Denuvo Anti-Cheat trial (Behaviour’s FAQ dates from August 2026, and a “Denuvo Anti Cheat Trial Update” was posted on Steam on September 15, 2026). Behaviour says the game disables it after the test and cleans up its files; if you want to remove leftovers by hand, uninstall “Denuvo Anti-Cheat” from Add or remove programs. Behaviour warns this can affect other games that use Denuvo Anti-Cheat.

8. Still crashing? What support needs

• Behaviour has pages explaining how to collect your Dead by Daylight logs, a DirectX Diagnostic (DxDiag) and a Microsoft System Information report (MSInfo). Attach them to a request on the official support site.

Sources (read November 11, 2026)

• Behaviour support, Game Crashing (created August 28, 2026): https://support.deadbydaylight.com/hc/en-us/articles/53015576526996-Game-Crashing

• Behaviour support, EAC Launch Error July 2026 (updated October 29, 2026): https://support.deadbydaylight.com/hc/en-us/articles/51467879809428-EAC-Launch-Error-July-2026

• Behaviour support, Crash and Error Code Master Fix Guide (PC) (updated November 4, 2026): https://support.deadbydaylight.com/hc/en-us/articles/4498833782804-Crash-and-Error-Code-Master-Fix-Guide-PC

• Behaviour support, Game Security Violation Detected: https://support.deadbydaylight.com/hc/en-us/articles/4585452382100-Game-Security-Violation-Detected

• Behaviour support, EasyAntiCheat (EAC) Driver Enforcement Error: https://support.deadbydaylight.com/hc/en-us/articles/360000487863-EasyAntiCheat-EAC-Driver-Enforcement-Error

• Behaviour support, Untrusted System File: https://support.deadbydaylight.com/hc/en-us/articles/360041577951-Untrusted-System-File

• Behaviour support, minimum requirements: https://support.deadbydaylight.com/hc/en-us/articles/360054830831-What-are-the-minimum-requirements-to-run-Dead-by-Daylight

• Behaviour support, verify game files: https://support.deadbydaylight.com/hc/en-us/articles/4416242694036-How-do-I-verify-my-game-files

• Behaviour support, Denuvo Anti-Cheat FAQ: https://support.deadbydaylight.com/hc/en-us/articles/52891224375828-Denuvo-Anti-Cheat-FAQ

• Patch notes 10.2.2 (October 20, 2026) and 10.2.2b (November 9, 2026), Dead by Daylight on Steam: https://store.steampowered.com/news/app/381210