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[System File Checker Usage Tutorial] System File Check Tool

1. What is the System File Checker?

‌System File Checker (SFC)‌ is a built-in maintenance tool in the Windows operating system that ensures the stable operation of the system by scanning and repairing damaged ‌core system files‌ (such as DLL, EXE, SYS, etc.). Its unique advantages include:

✅ No Installation Required | Integrated into the CMD Command Prompt
✅ Free Repair | Automatically replaces incorrect/missing files
✅ In-depth Detection | Supports all versions of Windows (Win7~Win11)

II. How to use the SFC tool?

2.1 Basic Scan and Repair

Right-click the "Start" menu → Select "Windows Terminal (Admin)"
Enter the command and press Enter to execute:
```
sfc /scannow
```

Wait for the scan to complete (usually takes 15-30 minutes) Progress display: Windows Resource Protection found corrupted files and successfully repaired them Error message: Some files could not be repaired (advanced repair required)

▶️ ‌Operation Notes‌:

Windows 10: Open "Command Prompt (Admin)" via the search bar Windows 11: It is recommended to use the enhanced version of Windows Terminal

2.2 Advanced Repair Solutions

When the basic scan fails, execute the following steps in order:

Copy Code

Run DISM repair first (Internet connection required):
```
DISM /Online /Cleanup-Image /RestoreHealth
```

Restart the system and run sfc /scannow again Check detailed logs to locate problematic files: bash Copy Code findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfc_log.txt"

text Copy Code

III. Common Issues FAQ

❓ SFC scan stuck at 20%?

Normal phenomenon: The system is verifying critical files
Solution: Keep the power connected, pause antivirus software

❓ Shows "Administrator permissions required"?

Right-click Command Prompt → Run as administrator
Disable UAC control: Win+R enter msconfig → Tools → Change UAC settings

❓ Unable to repair all corrupted files?

Enter Safe Mode and rescan
Manually replace files: Use sfc /scanfile=file path to specify repair
Use system restore point to rollback

IV. Advanced Techniques

🔧 Offline System Repair

After mounting the system image, execute:

sfc /SCANNOW /OFFBOOTDIR=D:\ /OFFWINDIR=D:\Windows

🔧 Custom Scan Strategy Copy Code

Verify only without repair (diagnostic mode):

sfc /VERIFYONLY

Forcefully overwrite system files:

takeown /f file path icacls file path /grant administrators:F