System file checker, also known as SFC, is a system-file-corruption-checker utility built in Windows Operating System. It scans the integrity of all protected operating system files and replaces incorrect, corrupted, changed, or damaged versions with the correct ones.If there is asystem file missing orcorrupted in your Windows 10, it may not work properly, and you may encounter a system crash.
There are two ways to use SFC/SCANNOW command, one is using it from within Windows 10, the other is using it externally. Normally you don’t need to run the SFC externally unless your Windows 10 computer fails to boot. The following guide will describe both of them step by step, and offer you some recommendations on how to repair other Windows 10 system issues.
Here is how you can use the SFC /SCANNOW command to scan your Windows 10 computer for errors and to fix them automatically:
To run the System File Checker, an Elevated Command Prompt must be opened from within Windows.
As mentioned earlier, we can use the System File Checker externally after you have started the computer with a Windows 10 bootable media like a DVD or a USB drive.
Here is how you can use the command externally to scan your Windows 10 PC for corrupt or missing files and to fix the issues automatically:
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