The system file checker command sfc /scannow, which comes with Windows system, can be used to scan and fix system file problems. When using it, you need to run a command prompt as an administrator. After entering the command, the system will scan the protected file. The entire process takes several minutes. There may be three feedbacks on the execution results: no conflict is found, which means normal; the repaired file means that the problem has been resolved; if it is found that it is damaged but cannot be repaired, it is recommended to further deal with it in conjunction with the DISM command. Common usage scenarios include system crashes, update failures, driver installation abnormalities or computer lags. It is recommended to be one of the methods of regular maintenance and give priority to trying this method when encountering problems. 1. Open method: Win S search cmd, right-click to select Run as administrator; 2. Results and response: No problem is found, no operation is required, and the task has been repaired. If it cannot be repaired, it is necessary to combine DISM commands; 3. Applicable scenarios: system abnormalities, update failures, software installation problems, and system stuttering.

Windows system comes with a very practical tool called System File Checker, the most commonly used command is sfc /scannow . It can help you scan and fix problems in system files and solve some inexplicable system errors.

If you find that your computer is running abnormally, update failed, or there are strange system prompts, you might as well try this command first.

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

You need to run the command prompt as an administrator to execute this command:

• Press Win S to open the search bar and enter "cmd"
• Find "Command Prompt" in the result, right-click and select "Run as administrator"
• Enter sfc /scannow in the pop-up window and press Enter

At this time, the system will start scanning all protected system files. The entire process usually takes several minutes, and do not close the window during this period.

2. Possible results and response methods after execution

After the run is over, you will see several different feedback messages:

• "No integrity conflict was found in Windows resource protection" : It means that the system is fine and does not require repair
• "Windows Resource Protection Repaired Files" : It means that some issues have been automatically fixed
• "Windows Resource Protection found corrupt files but could not repair some of them" : Manual intervention may be required at this time

If you encounter the last situation, you can try to repair the system image in combination with another command DISM , for example:

 DISM /Online /Cleanup-Image /CheckHealth  
DISM /Online /Cleanup-Image /ScanHealth  
DISM /Online /Cleanup-Image /RestoreHealth

These commands can help you clean or restore the system image, and then run sfc /scannow again to see if the repair can be completed.

3. Common usage scenarios and suggestions

Many people will run this command under the following circumstances:

• Frequent system crashes or blue screen
• Windows update failed, prompting file corruption
• Problems occurred while installing software or drivers
• The computer becomes abnormally stuttered, and I suspect there is something wrong with the system file

It is recommended to run sfc /scannow once when the system is running relatively stable as part of regular maintenance. Although it is not done every day, if you encounter the above situation, this step can often quickly eliminate the root cause of the problem.

Basically these are the operations. Although it seems simple, it can indeed play a key role in many system problems. Remember to encounter situations that cannot be repaired, don't force it and see if you can use DISM or reset the system settings.

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