How to Fix ntdll.dll Errors on Windows

What Causes This?

ntdll.dll is a core Windows system file that helps apps interact with low-level Windows functions. Errors usually happen when the file is corrupted, when a program is crashing because of damaged temporary files or leftover app components, or when faulty drivers, bad RAM, or disk errors cause Windows to misread system files. In some cases, a recent Windows update, shell extension, or third-party app conflict is the real trigger rather than the DLL itself.

Common Symptoms

• Apps crash with an ntdll.dll error message
• File Explorer keeps restarting or closing unexpectedly
• Games or older programs crash right after launch
• Windows shows access violation or exception errors
• Random system instability after installing an app or driver

How to Fix It Manually

1. Restart your PC and check for a recent app or driver change

   • Press Start > Power > Restart.
   • If the error started after installing a program, plugin, or driver, remove it first.
   • Open Settings > Apps > Installed apps, find the recently added app, click the three dots > Uninstall.

2. Run System File Checker and DISM

   • Right-click Start and choose Terminal (Admin) or Windows PowerShell (Admin).
   • Run this command:

     sfc /scannow

   • Wait for it to finish, then run:

     DISM /Online /Cleanup-Image /RestoreHealth

   • Restart your PC after both scans complete.

3. Install Windows updates

   • Open Settings > Windows Update.
   • Click Check for updates and install everything available, including optional driver updates if they relate to your hardware.
   • Restart when prompted.

4. Clean temporary files and test the app again

   • Press Win + R, type %temp%, and press Enter.
   • Press Ctrl + A to select all files, then press Delete. Skip any files in use.
   • Repeat this with temp and then open Settings > System > Storage > Temporary files to remove more junk.
   • Temporary file corruption and app leftovers can trigger repeated ntdll.dll crashes.

5. Check your disk for errors

   • Open Terminal (Admin) again.
   • Run:

     chkdsk C: /f

   • If Windows asks to schedule the scan on restart, type Y and press Enter, then restart your PC.

6. Test in Clean Boot mode

   • Press Win + R, type msconfig, and press Enter.
   • On the Services tab, check Hide all Microsoft services, then click Disable all.
   • Go to the Startup tab and click Open Task Manager. Disable non-essential startup apps.
   • Restart your PC and test the problem app. If the error stops, a background service or startup program is likely causing the conflict.

7. Check memory if crashes keep happening

   • Press Win + R, type mdsched.exe, and press Enter.
   • Choose Restart now and check for problems.
   • If memory errors appear, faulty RAM may be behind the ntdll.dll crashes.

Fix It Automatically with Kudu

If you do not want to hunt through temp folders, app leftovers, and crash-causing junk manually, Kudu can do the cleanup for you. It helps remove temporary files and leftover app data that often contribute to repeated Windows and app errors, including ntdll.dll crashes caused by corrupted clutter and bad uninstall remnants.

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