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Here's how to Fix A critical system process C:\WINDOWS\system32\lsass.exe failed in Windows.

If you encounter the error message "A critical system process C:\WINDOWS\system32\lsass.exe failed" in Windows, it may indicate a serious issue with your system. Here are some steps you can take to troubleshoot and fix the problem:

1. Restart Your Computer: Sometimes a simple restart can fix the issue. Try restarting your computer and see if the problem persists.

2. Use System Restore: If the issue started recently, use System Restore to restore your system to a previous point in time before the error occurred.

3. Boot in Safe Mode: Boot your computer in Safe Mode to troubleshoot the issue. Press the F8 key during startup to access the Advanced Boot Options menu and select "Safe Mode."

4. Run a System File Checker (SFC) scan: Open Command Prompt as Administrator and run the command "sfc /scannow" to scan for and repair corrupted system files.

5. Run a Virus Scan: Use your preferred antivirus software to scan your computer for viruses and malware. For starters, Run Avast Internet Security@ https://www.anrdoezrs.net/click-7951287-12889080 to clear potential malware.

6. Repair Windows System Files: Open Command Prompt as Administrator and run the command "dism /online /cleanup-image /restorehealth" to repair any corrupted Windows system files.

7. Reinstall Windows: If all else fails, reinstall Windows to start with a fresh system.

It's important to note that lsass.exe is a critical system process that handles user authentication and security. If you're unable to fix the issue on your own, seek professional help to avoid causing further damage to your system.