In this article, you can learn to run SFC Scannow and fix SFC Scannow not working in Windows 7/8/10 accordingly.
By Ivy / Last Updated February 26, 2020
SFC (short for system file checker) is a Microsoft Windows tool, which is located in C:\Windows\System32 folder. It allows you to scan for or restore corrupted Windows system files. In Windows Vista, Windows 7, Windows 10, system file checker is integrated with Windows Resources Protection (WRP), which is used to protects registry keys and folders together with critical system files.
The Windows Modules Installer service (TrustedInstaller.exe) has full access to Windows Resource Protection files and registry keys, which allows you to modify WRP-protected resources. It needs to be running when you restore missing or corrupted WRP resources. And Administrators no longer have full rights to system files.
Step 1. Type cmd in the search box, select it from the start menu list and run as administrator.
Step 2. Type sfc /scannow in the command prompt and hit Enter.
Step 3. The process will take some time. You just need to wait and exit this window.
NOTE: If there is no problem or your problems cannot be fixed, you will receive some message in the command prompt window
Windows Resource Protection did not find any integrity violations.
That means that you do not need to do anything. Your computer does not have any missing or corrupted system files.
That means your problem is fixed by sfc.exe command. And you do not need to do anything.
Windows Resource Protection could not perform the requested operation.
That means that a problem occurs during running the scan and offline scan command.
Windows Resource Protection found corrupted files but was unable to fix some of them.
That means sfc / scannow cannot fix the corrupted files its find and you need to do something.
In addition, you still can receive other messages, such as Windows Resource Protection could not start the repair service, there is a system repair pending which requires reboot to complete, you must be an administrator running a console session in order to use the SFC utility, etc.
As mentioned above, you will receive different message according to your situation. In the following, I will show you how to fix SFC scannow does not work accordingly. See below and find the way that works for you.
If you receive this error message, it means the Windows Modules Installer service (TrustedInstaller.exe) is disabled. You need to enable it manually.
Here are two ways in the following. You can select the way you are familiar with.
Fix SFC scannow not running via Servcies
Step 1. Press Win + R to summon theRun window, type servces.msc and hitOK.
Step 2. Find Windows Modules Installer and double-click it.
Step 3. Set Startup type as Manual and then hit Apply and OK.
Fix SFC scannow not responding using CMD
Step 1. Type cmd in the search box and run as administrator. Type usernameand password if prompted.
Step 2. Type the following commands and hitEnter after each one.
sc config trustedinstaller start= auto
net start trustedinstaller
Step 3. Try SFC scannow commands again.
Run chkdsk command
Step 1. Open cmd and run as administrator. Type username and password if it prompts.
Step 2. Type chkdsk C: /r in the command prompt window and hit Enter. Type Y and hit Enter if it tells you that this volume is in use.
Step 3. Restart your computer and it will start to find and fix the problem. After that, you can run SFC again.
Run SFC scannow command in safe mode
Step 1. Start your computer in safe mode. In Windows 7, you can Start your computer, and press the F8 key repeatedly before showing the Windows logo and then select Safe Mode under the Advanced Boot Options. In Windows 10, you can click Restartwhile press and hold Shift key.
Step 2. Open cmd and run as administrator.
Step 3. Ensure the PendingDeletes and PendingRenames folder on your system.
Step 4.Type sfc / scannow in the command prompt window and hit Enter.
Change the security description
Sometimes, you will receive this error because this command cannot access WinSxS folder. And then you need to change the security description of this folder manually.
Step 1. Open cmd and run as administrator. Type username and password if prompted.
Step 2. Type ICACLS C:\\Windows\\winsxsand hit Enter.
Step 3. Reboot your computer.
Ifyou receive this message and SFCscannow does not fix problem, you can try to use DISM command to restore health.
Step 1. Open cmd and run as administrator. Type username and password if prompted.
Step 2. Type Dism /Online /Cleanup-Image /RestoreHealth in the pop-up window and press Enter.
You may also receive message: there is a system repair pending which requires reboot to complete. To fix it, you can try DISM RestoreHealth as mentioned above. If it does not work and you receive DISM doesn’t support servicing Windows PE with /Online option, you can try the following.
Run another DISM command
Step 1. Open cmd at boot.
Step 2. Type the following command and hit Enter.
dism.exe /image:c:\ /cleanup-image /revertpendingactions
Delete registry key for pending system repair
Step 1. Type regedit and select it from the start menu.
Step 2. In the registry editor, navigate to the following key.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RebootPending
Step 3. Right-click RebootPending key and selectDelete in the context menu.
Step 4. Exit this window and try SFC again.
System file checker is mainly used to restore missing or corrupted system files. If SFC scannow will not work in Windows 7/8/10, you can try free partition manager AOMEI Partition Assistant. It allows you to find and repair missing or corrupted system files.
In addition, you can use it to do more thing, such as resize partition, move partition, fix extend volume is disabled, add unallocated space to d drive, etc.
AOMEI Partition Assistant can satisfy the basic needs of the majority of users. But if you want more advanced features or fix problems the standard edition cannot, you can upgrade to AOMEI Partition Assistant Professional.
Step 1. Download AOMEI Partition Assistant and open it.
Step 2. Right-click the partition you want to check, select Advanced andCheck Partition option.
Step 3. Tick one of the check options and
click OK and it will start the progress.
Step 4. It will run the progress immediately, wait a minute and
click OK when the progress reaches 100%.
System file checker is a very useful tool in Microsoft Windows, but somestime you may find SFC scannow not working. In general, you will receive the corresponding message that gives you a clue to find the solution, such as, Windows Resource Protection could not perform the requested operation, Windows Resource Protection found corrupted files but was unable to fix some of them,Windows Resource Protection could not start the repair service, etc.
According to your own situation, follow the above way and fix SFC scannow not working Windows Resource Protection. If you cannot fix it, you still can try free AOMEI Partition Assistant to check partition and fix the missing or corrupted system files. This tool is very easy to use, even for a beginner.
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