STATUS_GENERIC_NOT_MAPPED (0XC00000E6) Fix That Actually Works

Quick Answer for Advanced Users

Run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth from an admin command prompt. If that doesn't fix it, reset Windows Security with Get-AppxPackage Microsoft.SecHealthUI | Reset-AppxPackage in PowerShell (admin). Then reboot.

What's Going On?

Error code 0XC00000E6 — officially STATUS_GENERIC_NOT_MAPPED — pops up when a program tries to start but Windows can't map a generic access right to a specific one. Sounds technical, but here's the real story: a security driver (Windows Defender, third-party AV, or a leftover driver from an old antivirus) is blocking the app's permissions. This usually happens after a Windows update or an antivirus update that changes security policies.

I've seen this most often with games and older business apps. Steam games, Adobe software, and custom .NET applications trigger it a lot. The error message can vary — sometimes you get a popup with just the code, other times it's a full BSOD. But the fix is the same.

Step-by-Step Fix

1. Run SFC and DISM — Open Command Prompt as admin. Type sfc /scannow and hit Enter. Let it finish. Then run DISM /Online /Cleanup-Image /RestoreHealth. This fixes corrupted system files that might've broken the security mapping. Restart after DISM completes.
2. Reset Windows Security — Open PowerShell as admin. Run Get-AppxPackage Microsoft.SecHealthUI | Reset-AppxPackage. This resets Windows Defender's configuration without removing it. Reboot again.
3. Disable third-party antivirus temporarily — If you have Norton, McAfee, Avast, or similar, turn off real-time protection. Don't uninstall yet — just disable it for 5 minutes and try launching the program that failed. If it works, you've found the culprit. Uninstall that antivirus completely (use their removal tool) and rely on Windows Defender.
4. Reinstall the problem program — Uninstall the app that throws the error. Restart. Download a fresh copy and install as administrator (right-click installer, Run as admin). This often clears up leftover permission issues.

If That Didn't Work — Try These

• Clean boot — Type msconfig in Run, go to Services tab, check "Hide all Microsoft services", click Disable all. Then go to Startup tab, open Task Manager, disable all startup items. Restart. Try the app. If it works, enable services one by one until you find the offender.
• Check for leftover antivirus drivers — Run fltmc in admin CMD. Look for anything that says "avc", "avp", "mp" (Malwarebytes), or "sym" (Symantec). If you see old AV filters, use fltmc unload [driver name] to remove them. But be careful — you can break things. Better to use the AV vendor's cleanup tool.
• System Restore — Restore to a point before the error started. Type "System Restore" in Start, pick a date, and go back. This is a last resort but it works.

Prevention Tips

Don't run two antivirus programs at once. Windows Defender + third-party AV is a common cause for this error. Stick with one.

Keep Windows updated. After every major update, check for app compatibility. And if you're using an old program (like a 2015 game), run it in compatibility mode for Windows 7 or 8. Right-click the EXE, Properties, Compatibility tab, check "Run this program in compatibility mode for" and select an older OS.

Also, avoid installing random "system cleaners" or registry fixers. They mess with security descriptors and can trigger this exact error. I've seen it dozens of times.