The sfc /scannow command is a well known way to do an integrity check of all Windows 10 system files. sfc.exe is the System File Checker tool which can be helpful in many scenarios and fix various issues with Windows 10. If for some reason you are unable to boot into Windows 10, then you may not know how to run the System File Checker. Thankfully, sfc supports offline scanning of a Windows installation even if does not start properly. All you need is a bootable media with Windows 10 setup, i.e. Windows 10 installation DVD or a bootable USB stick.
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