SFC Scannow Command
Before talking about sfc /scannow, lets see some information about System File Checker.
System File Checker (SFC)is a useful utility built into Microsoft Windows.
This tool allows you to scan corrupted system files and repair them.

Moreover,sfc /scannowis the most common command of System File Checker.
How to Use SFC Scannow?
Tool 1:data backup with MiniTool ShadowMaker;
Tool 2:data backup with MiniTool Partition Wizard.

How to run sfc /scannow?
Here is the tutorial.
Or press theWindowskey and theXkey on the keyboard.
Step 2: Run Command Prompt as an administer by giving a right click onCommand Promptand selectingRun as administrator.
Step 3: When the Command Prompt window shows up, yo typesfc /scannowand click Enter on the keyboard.
You may receive one of the following messages, some of which indicate errors.
Step 5: start your PC if this is not done automatically.
Case 2: Run sfc /scannow in Windows 7 and earlier versions.
Step 1: Typedism.exe /online /cleanup-image /restorehealthand pressEnteron the keyboard.
Step 2: Repeat Step 3 to Step 5 in Case 1.