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Fortnite won't launch on PC? Diagnose it and try 8 fixes

✓ Reviewed & updated July 19, 2026

By the ErrorAway Editorial Team · How we research and review guides

Use the point where launch stops to choose the next test. Epic Games Launcher failing to open is different from Fortnite remaining marked Running, an Easy Anti-Cheat message, a graphics crash after the splash screen, or a server outage. Start with service and file checks before changing security settings or reinstalling a large game.

Repeat the same launch action after each step and stop when it works. Keep the complete error text. Do not disable antivirus, firewall or Secure Boot, and do not download replacement anti-cheat or DLL files from unofficial sites.

Quick checklist

  1. Match the launch stage and check Epic status
  2. Restart the launcher and Windows
  3. Install Epic, Fortnite and Windows updates
  4. Verify Fortnite files
  5. Repair Easy Anti-Cheat for EAC errors
  6. Check Windows Security history safely
  7. Isolate graphics or overlay conflicts
  8. Preserve account access, then reinstall as a last step

Match the launch stage before changing anything

What you seeBest first checkWhat it isolates
Epic Games Launcher also will not openRestart it and troubleshoot the launcher firstThe failure occurs before Fortnite starts
Fortnite stays marked Running with no windowRestart, verify files, then repair EACA stuck game process, file or anti-cheat startup issue
Easy Anti-Cheat error names installation/service failureUse Epic's exact EAC repair/install articleThe anti-cheat service rather than general graphics
Splash screen appears, then a graphics error or crashUpdate Windows/GPU driver and isolate overlaysThe rendering path or third-party overlay
Login, matchmaking or many Epic services failCheck Epic Games Public StatusA service incident that local reinstalling cannot fix
Security boundary: do not turn protection off or add an entire drive to exclusions. If Windows Security quarantined a file, verify that its path belongs to the official Epic/Fortnite installation and follow the exact Epic support article for the displayed error. On a managed PC, ask the administrator.

The 8 checks, from lowest to highest impact

1

Check Epic status and record the error

Open Epic Games Public Status. If Fortnite login or game services show an incident, wait for recovery. Otherwise copy the complete error and note whether it appears before or after the Easy Anti-Cheat screen.

Result checkAn active incident is a stop condition. If services are normal, follow the row that matches your launch stage.
2

End stuck Epic/Fortnite processes and restart

  • Exit Epic Games Launcher from its notification-area icon.
  • Open Task Manager with Ctrl + Shift + Esc.
  • End only clearly named Epic Games Launcher, Fortnite or Easy Anti-Cheat processes, then restart Windows.
Result checkOpen Epic once and launch Fortnite. If the Running state clears and the game opens, stop.
3

Update the launcher, game and Windows

Allow Epic Games Launcher to finish its own update and any Fortnite download. Open Settings → Windows Update, install available updates and restart when prompted. Use the PC or GPU manufacturer's official channel for a graphics driver if the crash starts after the splash screen.

Result checkRetest once. If the message now specifically names EAC, move to the EAC branch rather than reinstalling the GPU driver again.
4

Verify Fortnite game files

In Epic Games Launcher, open Library, select the three dots beside Fortnite, choose Manage, then Verify. Epic says verification checks installed files and repairs changed or damaged ones without affecting saved data.

Result checkWait for verification to finish before launching. If the same EAC error remains, repair EAC next; if the same graphics crash remains, use the graphics branch.
5

Repair Easy Anti-Cheat for an EAC error

Use Epic's instructions for the exact message. Epic documents locating the installed EAC files through Fortnite → Manage → Open Install Location and repairing or reinstalling the service from the official Fortnite folder.

If the dialog specifically says “Please unload MsIo64.sys before starting the game”, repair is not the first step. Follow the MsIo64.sys driver-conflict guide to identify and update or remove the owning hardware utility safely.

  • Launch Fortnite from Epic Games Launcher, not an unknown executable.
  • Do not download a separate EAC installer from a third-party site.
Result checkIf the EAC screen completes and the game opens, stop. If the service repair itself errors, save that message for Epic Support.
6

Check Windows Security history without disabling it

Open Windows Security → Virus & threat protection → Protection history. Look for an entry at the same time as the failed launch. Verify its path and publisher before taking action.

  • If nothing was blocked, do not create speculative exclusions.
  • If an official Fortnite/EAC file was blocked, follow the relevant Epic and security-vendor guidance.
  • For an organization device, ask the administrator to review the event.
Stop conditionNever restore a similarly named file from Downloads, a temporary folder or an unofficial game copy.
7

Isolate graphics and overlay conflicts

Use this branch when Fortnite passes EAC and crashes around the splash screen, lobby or rendering. Close optional overlays and recording/tuning tools, then repeat once. Install an approved GPU driver update if one is available.

  • Change one item at a time so the result identifies the conflict.
  • Do not disable Windows services in bulk.
  • If a crash report names a file, include that name when contacting support.
Result checkIf closing one overlay reliably fixes launch, update or remove only that application. If other games also crash, investigate the wider graphics/Windows problem.
8

Confirm account access, then reinstall as a last step

Before uninstalling, confirm the Epic account and sign-in method you use. Account-linked purchases and progression are separate from installed game files, but local configuration, captures or other unsynced files can still be removed. Back up anything locally important.

Uninstall Fortnite through Epic Games Launcher, restart Windows, then reinstall it to a drive with sufficient free space. Use Epic's official launcher only.

EscalateIf a verified fresh installation shows the same error, contact Epic Support with the exact message, logs/crash ID if offered, Windows version and completed checks.

Primary references: Epic Games Support's game-file verification instructions, Fortnite EAC error guidance, and the Epic Games Public Status page.

Frequently asked questions

Will verifying Fortnite files delete my progress?

Epic states that its Verify process repairs installed files without affecting saved data. It is still different from uninstalling, deleting local folders or resetting Windows.

Should I disable antivirus to test Fortnite?

No. Check Protection history for a matching event and verify the path/publisher. Follow the exact Epic or security-vendor guidance instead of turning protection off or adding broad exclusions.

Why is Fortnite marked Running with no window?

Restart the launcher and Windows, verify files, then use Epic's EAC repair path. That sequence targets the most relevant layers without jumping straight to a full reinstall.

When should I reinstall?

After status, restart, updates, Verify, the exact EAC branch and graphics/overlay isolation have failed. Confirm account access and preserve unsynced local files first.

If Epic shows a generic “Could not call proc” runtime error or Windows names Bad Image error 0xc0000020, follow that exact message. If Fortnite remains stable but streaming software fails, use the OBS crash guide.

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