What should I do if the Win8 system file is damaged or lost?

Solution: If you have this problem, you need to find the damaged file and fix it.
Solution:
First, look at the command file checker tool usage method
1, use the key combination "CTRL + F" in win8 to open the search, or find the search in the start screen and enter " CMD "and open the command prompt as an administrator;

2, after opening a command prompt window and type" sfc /scannow ", then press enter or OK;

3. After the command sfc /scannow is executed, all protected system files will be scanned and the corrupted files will be replaced with cached copies in the compressed folder located in %WinDir%System32dllcache.
The %WinDir% placeholder represents the Windows operating system folder. For example C: Windows.
It takes a certain amount of time during the verification process. Do not close this Command Prompt window until the verification is 100% complete. The scan results will be displayed after the process ends.
Second, after the completion of the scan, the following messages will generally appear:
1, Windows Resource Protection can not find any integrity conflicts.
This means that you do not have any missing or corrupted system files.
2. Windows Resource Protection cannot perform the requested operation.
To resolve this issue, execute the System File Checker in Safe Mode and ensure that the PendingDeletes and PendingRenames folders exist under %WinDir%WinSxSTemp.
3. Windows Resource Protection found the corrupted files and successfully fixed them. The details are included in CBS.Log%WinDir%LogsCBSCBS.log.
To view detailed information about system file scans and restores, first review the details of the System File Checker process.
4. Windows Resource Protection found a corrupted file but could not repair some files. The details are included in CBS.Log%WinDir%LogsCBSCBS.log.
Third, if the user can not be repaired by the SFC file checking tool, you can also try to use the DISM command, you need to network.
Run the following command as an administrator:
DISM.exe /Online /Cleanup-image /Scanhealth
Note: This command means to scan all your system files and compare them with the official system files