Repair Windows System Files: sfc scannow

repair wndows system files

How to Repair Windows System Files: Windows, as we all know, rules the world of operating systems. It manages a wonderful trade-off between quality and price. Windows operating system often provides a decent experience to its end users. However, there are times when people face issues, especially when they try to install any Windows update. There are a whole lot of examples of Windows Update Errors.

Do you know one of the primary cause of Windows update errors? It is the damaged or corrupted Windows System files. When you try to install any Windows update, it may be possible that the System files or dll files on your system have been corrupted, damaged or are not compatible with the new update. What shall we do in such a scenario? Well, Windows is smart enough to figure out this issue. As a result of this, Windows comes up with an inbuilt command to tackle this issue. This command is often known as System File Checker (sfc).


There are some pre-requisites for sfc command to work as desired. Don’t worry, these are not many.

  1. Whenever you make use of sfc command, make sure you are opening the command prompt as an Administrator only. Otherwise, the command may not work as desired.
  2. There a number of options available for sfc command. We have to make use of those functions along with sfc command. Otherwise, it won’t work at all. Once such option is scannow. The executable command is sfc scannow.


As mentioned before, Windows operating system comes up with an inbuilt command called System File Checker (sfc), that can be used along with available options to repair Windows System Files and dll files.


System File Checker (or sfc for short) is an inbuilt Windows command that scans your entire system for corrupted, damaged, and incompatible system files and dll files and replaces them with the latest and correct files. The sfc command is available in the following versions of Windows operating system:

  1. Windows 10
  2. The Windows 8.1 and 8
  3. Windows 7
  4. Windows XP and Vista

Now that we know what exactly this command is, it is time to know how to use it to repair Windows System Files.


We have prepared a step by step guide to ease the process of using the sfc command to repair Windows system files and dll files. Simply follow the steps given below and by the end of this article, you will be good to go.

  • Click on Start button and type cmd. Right-click on cmd and choose Run as Administrator. This will open the command prompt as Administrator.

repair windows system files

  • Once the command prompt is open, type the following command in it and press Enter key.

sfc /scannow

repair windows system files

  • Now the System File Checker will start scanning the entire system for Windows System files and dll files. Please note that it may take some time depending upon your RAM and number of files.
  • One it is completed, it will show you the final report. Reboot your system.
  • That’s all. You have successfully repaired system files on your system.

That was easy, isn’t it? Well, this method works for almost all the Windows Update errors. So, if you are also facing any such issue, make sure you give this method a shot and get rid of any such Windows-specific issue. Hope you liked this article.

If you are stuck somewhere and need our assistance, feel free to drop a comment in the comment section below this post. We will try to resolve your query as soon as possible. Read another article or view more tips at

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