If you encounter problems when running SFC, you can solve them as follows: 1. Turn off the high-occupancy program when stuck, check the hard disk, close the security software, or enter safe mode; 2. If you prompt that the file cannot be repaired, use DISM tools to repair the system image, ensure that the network is connected and run as an administrator; 3. Check the administrator permissions and environment variable settings when the error "Access denied" or "Command not found".

Windows System File Checker (SFC) is a practical tool that comes with the system to scan and repair protected system files. But sometimes you may encounter various problems when running sfc /scannow , such as stuck, error reporting, and inability to complete the scan. Here are some common problems and corresponding solutions.

What should I do if the SFC scan is stuck?

This is a common problem that many people encounter when using SFC. When you enter a command, the progress bar is stuck at a certain percentage, or does not respond for a long time, it may be caused by the following reasons:

• System resource usage is too high : There are programs in the background that occupy a large amount of CPU or memory, causing SFC to run slowly.
• The hard disk reads and writes slowly or makes errors : In particular, the mechanical hard disk has bad channels, which may cause scanning lag.
• Third-party security software interference : Some antivirus software will intercept or delay system processes.

Recommended operations:

• Close unnecessary startup items and services and release system resources.
• To check the health status of the hard disk, you can use the chkdsk command to scan the disk error first.
• Temporarily turn off the antivirus software or firewall and run SFC.

If it still doesn't work, you can try to enter "safe mode" and then run SFC, which can reduce interference.

SFC prompts "Integrity scan and repair cannot be performed"

This usually occurs when some system components are severely damaged or have insufficient permissions. Common prompts include:

Windows Resource Protection found the corrupted files, but some of them cannot be repaired.

This may be because:

• WinSxS storage corruption : SFC relies on components in the WinSxS folder for repair. If there is a problem with this directory itself, it cannot be restored.
• Missing network connection : Some fixes require network download of original system files (especially systems with "On-Demand Feature Update" enabled).
• Permissions issue : The command prompt was not running as administrator.

Solution:

• Use the DISM tool to repair the system image first:

   dism /online /cleanup-image /startcomponentcleanup
  dism /online /cleanup-image /restorehealth

• Make sure the computer is connected to the Internet.
• Right-click the command prompt and select "Run as administrator".

SFC error "Access denied" or "Command not found"

If you receive prompts such as "Access denied", "Not an internal or external command" when running SFC, the following reasons may be:

• Insufficient permissions : The command prompt was not run as administrator.
• The system path is modified : the environment variable is set abnormally, causing the system to not find sfc.exe.
• Account permissions are restricted : The current user does not have administrator permissions.

How to deal with it:

• Be sure to right-click the command prompt → Run as administrator.
• Check whether the current user's permissions are members of the Administrators group.
• If you suspect that the system path has been changed, you can check whether the Path setting is normal in "System Properties → Advanced → Environment Variables".

Basically, these common SFC problems are just about them. Although it is a basic tool, it is very useful at critical moments. Don’t rush to reinstall the system when you encounter problems. Try the above methods first, maybe it will solve the problem.

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