How to Quickly Solve the Critical lsass.exe System Failed Error on Windows 11? Easy Steps for a Happy Computer

Why Does the lsass.exe Failed Error Happen on Windows 11? (Simple Fixes for a Stress-Free PC)

The Local Security Authority Subsystem Service (lsass.exe) keeps your computer safe. If it fails, your PC may crash with a blue screen. Error codes like c0000008, c0000354, or 80000003 often appear. This means your system needs help to work right.

Solution 1: Remove the Problem Update

If the error started after a Windows update, that update may be the cause.

1. Open Settings (Win + I).
2. Go to Windows Update > Update History.
3. Click Uninstall Updates.
4. Find the last update and uninstall it.
5. To stop Windows from reinstalling it, use the Show or Hide Updates Tool from Microsoft. Run the tool and hide the update you just removed.

Solution 2: Turn Off Fast Startup

Fast Startup helps your PC start faster, but it can cause errors.

1. Open Control Panel and pick Power Options.
2. Click Choose what the power buttons do.
3. Click Change settings that are currently unavailable.
4. Uncheck Turn on Fast Startup.

Solution 3: Run System Scans in Safe Mode

Safe Mode starts Windows with only the basics.

1. Hold Shift and restart your PC.
2. Go to Troubleshoot > Advanced Options > Startup Settings > Restart.
3. Press F4 to enter Safe Mode.
4. Open Command Prompt as administrator.
5. Type sfc /scannow and press Enter. Wait for the scan to finish.
6. Next, type DISM /Online /Cleanup-Image /RestoreHealth and press Enter.
7. To check your disk, type chkdsk C: /f /r /x and press Enter. Let it finish, then restart.

Solution 4: Scan for Malware

Viruses can break system files.

1. Open Windows Security from the Start menu.
2. Click Virus & Threat Protection.
3. Click Scan options, then pick Full Scan.
4. Click Scan now and wait for it to finish.

Solution 5: Update or Reinstall Drivers

Bad drivers can cause system errors.

1. Right-click Start and pick Device Manager.
2. Look for devices with a yellow triangle.
3. Right-click the device and select Update driver.
4. Let Windows search and install updates.
5. If that doesn’t work, right-click and pick Uninstall device. Restart your PC to reinstall it.

Solution 6: Reset Windows (Last Resort)

If nothing else works, reset Windows.

1. Open Settings and click System.
2. Scroll to Recovery.
3. Click Reset PC.
4. Choose to keep your files or remove everything.
5. Follow the steps to reinstall Windows.

Extra Tips

• Always back up important files before big changes.
• Write down any error codes you see.
• Keep Windows and drivers up to date.
• Use only trusted antivirus software.

Fixing the lsass.exe failed error is possible. Each step above helps your PC work better and keeps your files safe. Stay patient, try each fix, and your computer can run smoothly again.