What is a system file?
For system file repair in Windows 7/8/10, you can try SFC (system file checker) command first. It can scan your computer and find the corrupted files, then restore the corrupted system files. Type cmd in the search box and then select Run as administrator. Download System Update Readiness Tool for Windows 7 (32-bit) for Windows to remove the inconsistency in the Windows servicing store which may prevent the successful installation of future updates.
- There are pointers to some free antivirus tools, for instance, and buttons to check your hard drive for errors, run the System File Checker, and create or restore a System Restore point. For the real power here, though, click Start Repairs, select 'Custom Mode' and click Start.
- The Windows System File Checker (SFC) is a tool that is built in to all modern versions of Windows. This tool allows you to repair corrupted system files in Windows. SFC can be run with Administrator privileges both from within Windows, and using Windows recovery media.
A system file is an important computer file, as its name implies, without which or it's damaged, a computer system may not work correctly. It usually comes as part of the operating system for its core operations.
And Microsoft Windows mark these system files with a 'system' attribute to protect them against mistaken deletion. And it’s located in a system folder, such as, C:WindowsSystem32.
System files corrupted or missing: how to identify and why
Like a corrupted file, if something goes wrong with it, you will lose access to it. If you try to open it, you will receive an error message that implies the file is corrupted or damaged. If the file is a system file, the situation may become much worse, such as, you may encounter a blue screen, saying, 'your PC ran into a problem and needs to restart'.
Besides Windows errors, the corrupted files sometimes are much smaller than they should be. Also, you can compare the potentially corrupted files to another file of a similar type for identifying. Afterward, you may be eager to know how to repair corrupt system files in Windows 7/8/10?
However, before that, you need to get the reasons for this error. In fact, behind corrupted or missing system files, there are many reasons, such as, computer crashes, sudden power drops or surges, update errors, disk problems, third-party programs, virus attacks, human error.
How to repair Windows if system files are corrupted or missing
After identifying the system files are damaged and its potential reasons, you can repair system files using cmd. The system file checker is the best way to start the troubleshooting.
It's Windows 7 system files repair tool to scan your computer for corrupted system files and attempts to restore any it finds. And all of the following methods also apply to other systems, including Windows 8, 10, 11. You can try it first and then other ways.
#1: System files integrity check and repair Windows 7
Step 1. Type cmd in the search box and then select Run as administrator.
Step 2. Type sfc /scannow in the command prompt and hit Enter.
After the sfc /scannow end, you may get if the system repair is fixed or not. If it says 'Windows Resource Protection could not perform the requested operation', you can repair system files in safe mode or using CD/DVD that comes with your computer if your computer still have trouble. You can directly press Shift +F10 to open command prompt in the Windows Setup window.
Besides, you still can receive that there are still some unrepaired system files with error messages like “Windows Resource Protection found corrupt files but was unable to fix some of them. Details are included in the CBS.Log %WinDir%LogsCBSCBS.log. ”. Try next way in the following.
#2: View SFC log and repair system files manually
In this case, you should create a SFC log file with the CBS log file, then find the corrupt or missing Windows file and replace it with a good one.
Create and View the SFC log file
Step 1. Open cmd as administrator, enter the following command in the pop-up window and then hit Enter. This operation can help you create a sfclogs.txt file on the desktop.
findstr /c:”[SR]” %windir%LogsCBSCBS.log >”%userprofile%Desktopsfclogs.txt”
Step 2. Open the sfclogs.txt file, find the date and time entry for a file that could not be repaired.
Note : the Sfcdetails.txt files use Date/Time SFC details format, thus you need to verify the date and time entries. Then, you can use it to find the unrepaired files.
Repair damaged system files in Windows 7/8/10/11
1. Find known good system files copies on another computer with the same version of the operating system.
2. Open CMD as administrator.
3. Type the following command to take ownership of the corrupted files and hit Enter to run it.
takeown /f C:WindowsSystem32appraiser.dll
Note: C:WindowsSystem32appraiser.dll refers to the path and name of the corrupted system file. You should replace it.
4. Type the command below to give a full admin access to the corrupted files and then hit Enter.
icaclsC:WindowsSystem32appraiser.dll /Grant Administrators:F
5. Type the following command to replace the damaged system files and press Enter.
copy D:Filesappraiser.dll C:WindowsSystem32appraiser.dll.
Note: D:Filesappraiser.dll refers to the path and name of the known good file. You should replace it.
6. Type yes in the window and then Press Enter.
7. Type sfc /verifyonly command to check the integrity of all the system files and press Enter to move on. Wait until the process is 100% complete.
#3: Windows 7 missing files repair online via DISM
Besides SFC, you still can try DISM command utility in Windows 8/10 to automatically fix SFC Scannow not working. And it will scan and repair system files in Windows 8/10.
Step 1. Run cmd as administrator.
Step 2. Type the following command in the pop-up window and hit Enter.
DISM /Online /Cleanup-Image /RestoreHealth
#4: Repair Windows 7 system files without CD
System Restore is a great choice if you cannot repair Windows 7 still now. It's to restore system files, Windows Updates, settings, and applications to an earlier state. And It’s easy to learn and operate, you can try it with the following steps.
Step 1. Type system restore in the search box and select it.
Step 2. Select Recommended restore, and follow the wizard until the last step. If the recommended restore point is not available, you can try another restore point by ticking Choose a different restore point.
Sometimes, you will find that there is no system restore points in Windows 7/8/10/11. Don’t worry about it. You can try the last two solutions to repair system files.
Effective tips: always keep system files in a safe way
System files are crucial to ensure your computer works as it is supposed to, thus, it's necessary to create a system image backup including all of the system files. And you can easily repair windows 7 system files without losing data using this backup image, even if it crashes, not to mention the corrupted system files.
Then, how to make it? You need the best free backup software - AOMEI Backupper Standard. With it, you can backup system to external hard drive, USB drive, cloud drive like Dropbox, Google Drive, etc. And below are useful useful features for it:
- Besides System Backup, you still can use File Backup, Disk Backup, and Partition Backup.
- Options: You can comment on task, enable email notification, compression, splitting, intelligent sector backup, VSS backup mode, etc.
- Schedule Backup: You are allowed to set backup frequency for this task, including Daily, Weekly, Monthly.
- Scheme: You can choose to backup only changes on the system partition with its Incremental Backup instead of making a full system every time.
- Various System support: Windows 11/10/8.1/8/7/XP/Vista.
Now, follow the steps below to backup system:
Step 1. Download free AOMEI Backupper Standard, install and launch it. Click Backup and System Backup to start the operation.
Step 2. The system-related partition will be selected by default. Move you mouse to the second box and click the folder-shapped button to select the destination path for backup.
Step 3. Confirm this operation and click Start Backup to backup system in Windows.
After the backup created successfully, you can use it for corrupted system files repair or other computer failure. Go to the Restore tab, choose Select Task or Select Image File, then find your image and select destination, click Start Restore. T
If your image is saved on the external hard drive and the computer is unbootable, you need to create a bootable disk first. And then, connect the drive containing your backup image and boot from it . At last, restore image from external hard drive based on instructions
Another reliable backup software to protect your system and system files:
Except for AOMEI Backupper Standard, you still can try one key recovery software - AOMEI OneKey Recovery. The difference is that this software allows you to save system images on a hidden recovery partition, which greatly avoids mistaken deletions and data loss risk due to computer failure.
And it enables you to set fast key ('F11' or 'A') or boot menu to access this software quickly, even when it's slightly damaged. In addition, it not only supports Windows 7/8/10/11, but also supports Windows Server 2003/2008/2012/2016/2019/2022 including the R2 version. All operations are quite simple.
To backup system files, just choose OneKey System Backup after launching AOMEI OneKey Recovery. Then, select a way to backup your system and where to save it. Finally, click Start Backup.
Also, you can set compression or password protection for it. And backup frequency (daily, weekly, monthly) are also supported.
Wrapping things up
This article is the right place if your system files are corrupted. It provides you with 4 helpful ways to repair system files in Windows 7. And them also applies to Windows 8/8.1/10/11.
System File Checker Tool Windows 7 Free Download 64-bit
If you don't want to receive this error or any other computer failure, it's not enough. You can choose to create a complete system backup in Windows with AOMEI Backupper Standard or AOMEI OneKey Recovery, preferably a scheduled one. Since it will retain all of your changes util the recent one you create.
System File Checker Tool Windows 7 free. download full Version
For advanced users, you still can do system clone to HDD/SSD with AOMEI Backupper. It can achieve the same effect, but the process is simpler. You just need to clone system once, and don't need to restore it before using it. no restore required before using. If needed, please upgrade to AOMEI Backupper Professional first.