SFC /ScanNow (System File Checker) Repair Windows OS

SFC /ScanNow(System File Checker) Repair Windows OS

Whenever you face a Windows OS Error in Pc or Laptop then You find tech-expert will tell run sfc scannow or SFC /ScanNowSystem File Checker and it will fix the problem. This cools command will make awestruck what just happened and with the simple step, they fix your device and charge a huge lot of money.

In this article, I am going to explain

  • What is SFC /ScanNow?
  • What does it do?
  • How to Use SFC /ScanNow.
  • Technical details of sfcscannow command.

What is SFC /ScanNow(System File Checker)?

System File Checker (SFC) is a utility in Microsoft Windows that allows users to scan for and restore corruptions in Windows system files. Microsoft ships this utility with Windows 98, Windows 2000 and all subsequent versions of the Windows NT family of operating systems. In Windows Vista, Windows 7 and Windows 10, System File Checker is integrated with Windows Resource Protection (WRP), which protects registry keys and folders as well as critical system files. Under Windows Vista, sfc.exe can be used to check specific folder paths, including the Windows folder and the boot folder. (Wikipedia)

Origin of this command (SFC.exe) is first implemented in Windows 95 Due to DLL hell Problem. Later on, It becomes a full part of Windows OS Eco Systems.

What does Sfc /scannow do?

In Layman terms this command as soon it runs it will scan verify and repair corrupt protected windows file. One thing needs to remember that this will not fix any error program installed on the device. It only repairs only windows internal.

How to Use SFC /ScanNow:

  1. Open the command prompt. (Runs As Administrator)


2. If you are using Windows 10, Windows 8.1 or Windows 8, first run the inbox Deployment Image Servicing and Management (DISM). Run this command.

Type dism.exe /online /cleanup-image /restorehealth  and Hit Enter.

This process takes time.so don’t just rush wait.

For Windows 7 or earlier os user no need to run this one.

3.When the above process finishes then Run Sfc command.

Type sfc /scannow and Hit Enter

System File Checker

The command will scan all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir%\System32\dllcache

This Process also takes some time so be patience. When this process complete you will this message on the prompt screen.

  • Windows Resource Protection did not find any integrity violations. (No Error)
  • Windows Resource Protection could not perform the requested operation. (Run The Proces In Safe Mode)
  • Windows Resource Protection found corrupt files and successfully repaired them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log. (Found corrupt file and fixed them)

When The Process Complete then Restart the computer.

Technical details of sfcscannow command:

The system file checker utility, Sfc.exe, allows administrators to scan all protected resources to verify their versions.

Here are examaple of this comnad sytanx.


sfc /VERIFYFILE=c:\windows\system32\kernel32.dll

sfc /SCANFILE=d:\windows\system32\kernel32.dll /OFFBOOTDIR=d:\ /OFFWINDIR=d:\windows


You can Check Entire tutorial on our YoutTube Below


We hope this article on Repair Windows OS with SFC /ScanNow(System File Checker)  will help you to troubleshoot Windows OS Error Problem. If not, you are advised to let your device checked by the professionals. We recommend “Techyuga” as your destination.

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Techyuga Team

Techyuga Team

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