SFC scannow is a system file repair tool that comes with Windows, which can be used to repair corrupt or lost system files. When the computer experiences a system error, blue screen, or update failure, you can press Win S to enter "cmd" and run the command prompt as an administrator, and enter sfc /scannow to perform scan repair. There may be three situations during operation: successful repair, unsuccessful operation, and no corrupt files are found. If it cannot be fixed, you can try using the DISM tool in combination, run the three commands DISM /Online /Cleanup-Image /CheckHealth, DISM /Online /Cleanup-Image /ScanHealth, and DISM /Online /Cleanup-Image /RestoreHealth, and then run sfc /scannow. It is recommended to run this command when the system frequently reports errors, updates fail, abnormalities after installing the software driver, or suspected virus damage, and must be executed with administrator privileges to take effect.

SFC scannow is a system file checking tool that comes with Windows, which can automatically scan and repair corruption or loss of system files. If your computer has system errors, blue screens, or update failures, running sfc /scannow is a simple and effective troubleshooting method.

1. How to open a command prompt to run sfc /scannow

To run this command, you must first open the command prompt with administrator privileges:

• Press Win S to open the search bar and enter "cmd" or "Command Prompt"
• Right-click "Command Prompt" in the results and select "Run as Administrator"
• Enter the command: sfc /scannow , and press Enter to execute

At this time, the system will start scanning all protected system files and try to repair the problematic files. The entire process may take several minutes, and do not close the window during this period.

2. What may happen during operation

Sometimes you may encounter the following situations:

• "Windows Resource Protection found corrupt files and repaired successfully" : It means that the problem has been resolved
• "Windows Resource Protection cannot perform this request operation" : It may be because there is no administrator privileges, or the system files are too damaged
• "Corrupt system file not found" : means that the current system file is normal

If the problem is not solved for the first time, you can restart the computer and try again.

3. What if sfc /scannow cannot be repaired?

When sfc /scannow cannot fix the problem, you can try using the DISM tool in combination to repair the system image:

• Open the administrator command prompt and run the following three commands:
  • DISM /Online /Cleanup-Image /CheckHealth
  • DISM /Online /Cleanup-Image /ScanHealth
  • DISM /Online /Cleanup-Image /RestoreHealth

Running sfc /scannow again after running DISM often solves problems that cannot be handled before.

4. When is it recommended to run sfc /scannow?

Several common scenarios include:

• The system frequently reports errors or stutters
• Windows update failed
• Problems occur after installing software or driver
• Suspected that the system file was corrupted by a virus

Running sfc /scannow regularly is actually a way to maintain system health, especially when you feel unstable during use of the computer.

Basically that's it. The operation is not complicated but it is easy to ignore details. For example, it must be run with administrator privileges, otherwise the command will not take effect. If you encounter problems, you may save the hassle of reinstalling the system.

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