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If some Windows functions aren't working or Windows crashes, apply the System File Checker to scan Windows and restore your files.

Though the steps below might look complicated at first glance, just follow them in order, step-past-step, and we'll try to get you lot dorsum on runway.

Run the System File Checker tool (SFC.exe)

To exercise this, follow these steps:

1. Open an elevated command prompt. To practice this, do the following equally your appropriate:

2. If you lot are running Windows x, Windows 8.one or Windows 8, first run the inbox Deployment Image Servicing and Management (DISM) tool prior to running the System File Checker.  (If you are running Windows seven or Windows Vista, skip to Step 3.)

Type the following command, then press Enter.  It may take several minutes for the control operation to exist completed.

DISM.exe /Online /Cleanup-image /Restorehealth

Important: When you run this command, DISM uses Windows Update to provide the files that are required to prepare corruptions. Nevertheless, if your Windows Update client is already cleaved, use a running Windows installation as the repair source, or use a Windows side-by-side folder from a network share or from a removable media, such as the Windows DVD, as the source of the files. To do this, run the post-obit command instead:

DISM.exe /Online /Cleanup-Paradigm /RestoreHealth /Source:C:\RepairSource\Windows /LimitAccess

Notation: Replace the C:\RepairSource\Windows placeholder with the location of your repair source. For more than information about using the DISM tool to repair Windows, reference Repair a Windows Epitome.

1. At the command prompt, type the following control, and so press ENTER:

sfc /scannow

The sfc /scannow command will browse all protected system files, and replace corrupted files with a cached copy that is located in a compressed folder at %WinDir%\System32\dllcache.
The %WinDir% placeholder represents the Windows operating system folder. For example, C:\Windows.

Notation Practise non close this Command Prompt window until the verification is 100% complete. The scan results will be shown after this process is finished.

1. Subsequently the process is finished, you may receive i of the following messages:

   • Windows Resources Protection did not find whatsoever integrity violations.

     
     This means that you do not have any missing or corrupted system files.

   • Windows Resources Protection could non perform the requested operation.

     
     To resolve this trouble, perform the System File Checker scan in safety mode, and make sure that the PendingDeletes and PendingRenames folders be under %WinDir%\WinSxS\Temp.

   • Windows Resource Protection constitute decadent files and successfully repaired them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log.

     
     To view the detail information about the organization file scan and restoration, go to How to view details of the Organisation File Checker process.

   • Windows Resource Protection constitute decadent files but was unable to fix some of them. Details are included in the CBS.Log %WinDir%\Logs\CBS\CBS.log.

     
     To repair the corrupted files manually, view details of the Arrangement File Checker process to find the corrupted file, so manually replace the corrupted file with a known good re-create of the file.

Swipe in from the correct edge of the screen, and and then tap Search. Or, if yous are using a mouse, bespeak to the lower-correct corner of the screen, and and then click Search. Blazon Command Prompt in the Search box, right-click Command Prompt, and and so click Run as administrator. If you are prompted for an ambassador password or for a confirmation, type the password, or click Let.

To do this, click Kickoff, type Command Prompt or cmd in the Search box, right-click Command Prompt, then click Run as administrator. If y'all are prompted for an administrator password or for a confirmation, type the password, or click Allow.

More Data

How to view details of the System File Checker process

To view the details that included in the CBS.Log file, yous can re-create the data to the Sfcdetails.txt file by using the Findstr command, and then view the details in the Sfcdetails.txt. To exercise this, follow these steps:

1. Open an elevated command prompt as described in the previous pace ane.

2. At the control prompt, type the following command, and then press ENTER:

   findstr /c:"[SR]" %windir%\Logs\CBS\CBS.log >"%userprofile%\Desktop\sfcdetails.txt"                    

   Note The Sfcdetails.txt file contains details from every fourth dimension that the Organization File Checker tool has been run on the figurer. The file includes information about files that were not repaired by the System File Checker tool. Verify the appointment and time entries to determine the problem files that were found the last fourth dimension that yous ran the System File Checker tool.

3. Open the Sfcdetails.txt file from your desktop.

4. The Sfcdetails.txt file uses the following format:

   Date/Fourth dimension SFC detail The post-obit sample log file contains an entry for a file that could not be repaired: 2007-01-12 12:10:42, Info CSI 00000008 [SR] Cannot repair member file [50:34{17}]"Accessibility.dll" of Accessibility, Version = six.0.6000.16386, pA = PROCESSOR_ARCHITECTURE_MSIL (8), Civilization neutral, VersionScope neutral, PublicKeyToken = {l:8 b:b03f5f7f11d50a3a}, Type neutral, TypeName neutral, PublicKey neutral in the store, file is missing

How to manually supercede a corrupted system file with a known good copy of the file

After you lot determine which organisation file was corrupted and could not be repaired through the detail data in the Sfcdetails.txt file, detect where the corrupted file located, and and then manually replace the corrupted file with a known proficient copy of the file. To practice this, follow these steps:

Annotation You may exist able to get a known skillful copy of the system file from another figurer that is running the same version of Windows with your estimator. You lot may perform a System File Checker process on that reckoner to make sure the organization file that you intend to re-create is a skilful copy.

1. Take administrative ownership of the corrupted organization file. To do this, at an elevated command prompt, re-create and then paste (or type) the following command, and so press ENTER:

   takeown /f Path_And_File_Name Note The Path_And_File_Name placeholder represents the path and the file proper noun of the corrupted file. For example, type takeown /f C:\windows\system32\jscript.dll.
   

2. Grant administrators full access to the corrupted arrangement file. To exercise this, copy and paste (or blazon) the following command, and and then printing ENTER:

   icacls Path_And_File_Name /GRANT ADMINISTRATORS:F Notation The Path_And_File_Name placeholder represents the path and the file name of the corrupted file. For example, type icacls C:\windows\system32\jscript.dll /grant administrators:F.
   

3. Replace the corrupted organisation file with a known good copy of the file. To do this, copy and paste (or type) the following command, and and so press ENTER:

   Copy Source_File Destination Note The Source_File placeholder represents the path and file name of the known good copy of the file on your estimator, and the Destination placeholder represents the path and file proper noun of the corrupted file. For instance, blazon copy E:\temp\jscript.dll C:\windows\system32\jscript.dll.

If the steps above don't work, you may need to reinstall Windows. For more than info, see Windows 10 recovery options.

Need more help?

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Source: https://support.microsoft.com/en-us/topic/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system-files-79aa86cb-ca52-166a-92a3-966e85d4094e

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