What is sfc_os.dll?

Sfc_os.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. You can fix your sfc_os.dll problem by downloading the correct sfc_os.dll file. The following information can help you determine if sfc_os.dll is a Windows system file or if it belongs to an application that you can trust.

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Sfc_os.dll file information

The process known as Windows File Protection belongs to software Microsoft Windows Operating System by Microsoft (

Description: Sfc_os.dll is not essential for Windows and will often cause problems. Sfc_os.dll is located in the C:\Windows\System32 folder or sometimes in a subfolder of C:\Windows or in the C:\Windows folder. Known file sizes on Windows 10/8/7/XP are 164,864 bytes (59% of all occurrences), 140,288 bytes and 17 more variants. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program has no visible window. There is no detailed description of this service. It is not a Windows system file. It can change the behavior of other programs or manipulate other programs. Therefore the technical security rating is 64% dangerous, however you should also read the user reviews.

Recommended: Identify sfc_os.dll related errors

Important: Some malware camouflages itself as sfc_os.dll. Therefore, you should check the sfc_os.dll process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

fc.dll is a file that contains functions used to monitor system files for validity. It belongs to the Microsoft Windows environment. sfc_os.dll should not be disabled, required for essential applications to work properly.
Well i had this file missing from my Computer. When the computer is booting it says sfc_os.dll missing. Then i couldn't print on the HP F300 that was install on that Computer. So Webroot security said it was threat so i couldn't the printer, i did a reinstall printer and it will not install so i went in to webroot and reinstall sfc_os.dll and reinstall the file and my printer could work
  Tingwey Walter  

Summary: Average user rating of sfc_os.dll: based on 3 votes with 2 user comments. One user thinks sfc_os.dll is essential for Windows or an installed application. 2 users think sfc_os.dll is dangerous and recommend removing it. 2 users don't grade sfc_os.dll ("not sure about it").

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Best practices for resolving sfc_os issues

A clean and tidy computer is the key requirement for avoiding problems with sfc_os. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the sfc_os.dll process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

sfc_os.dll [all]