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3 sfc requires an elevated command prompt. Also explained what sfc does.
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RunFrom an elevated command prompt, run `sfc sfc /scannow on/scannow.

sfc is the System File Checker utility included in Windows prompt. When run with /scannow option, System File Checker verifies system files are in place and are not corrupted.

Run sfc /scannow on the Windows prompt.

From an elevated command prompt, run `sfc /scannow.

sfc is the System File Checker utility included in Windows. When run with /scannow option, System File Checker verifies system files are in place and are not corrupted.

2 answer had meaningless details
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winkey+r

enter "cmd.exe"

type "sfcRun /scannow"

press entersfc /scannow on the Windows prompt.

winkey+r

enter "cmd.exe"

type "sfc /scannow"

press enter

Run sfc /scannow on the Windows prompt.

1
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winkey+r

enter "cmd.exe"

type "sfc /scannow"

press enter