sfc

System File Checker

What Does It Do?

The sfc (System File Checker) command scans all protected Windows system files and replaces corrupted or incorrect versions with correct Microsoft versions.

Think of it like a doctor doing a checkup on your computer's vital organs. It looks at important system files and fixes any that are damaged or missing, helping prevent crashes and errors.

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When Should I Use It?

Windows Crashes or Errors

Fix Blue Screens of Death (BSOD) and system error messages.

After Malware Removal

Repair system files that may have been damaged by viruses.

Programs Won't Start

Fix missing DLL errors and application launch failures.

Before Major Updates

Ensure system integrity before installing Windows updates.

Common Commands

sfc /scannow

Scans all protected system files and repairs corrupted files.

sfc /verifyonly

Only scans for integrity violations, does not repair.

sfc /scanfile=<file>

Scans and repairs integrity of a specific file.

sfc /verifyfile=<file>

Verifies integrity of a specific file without repairing.

Try It Yourself

Practice sfc commands in the interactive terminal below: