Deleting system files can lead to big problems and it is highly recommended not to delete or modify them. System files are critical for the proper functioning of your operating system, and altering or removing them may cause Windows to stop responding properly. Additionally, the changes could cause system applications to stop working or lead to data loss.
If you still need to delete or overwrite a system file in Windows 7 or Vista, you may run into some trouble, even when logged in as an administrator. This is due to the system files in Windows being owned by the TrustedInstaller service and Windows File Protection prevents them from being modified or deleted.
Fortunately, there is a way around this. You can try taking ownership of the files and granting yourself the necessary permissions to delete or modify them. To do this, you can try to use the Command line.
Getting ownership of system files
To get started, open up the administrator command prompt by typing the letters “cmd” into the Start menu search box, then press the key combination Ctrl+Shift+Enter to run it as the administrator.
In order to take ownership of the file, you can try using the takedown command. Here is an example of the command you can use:
takeown /f C:\Windows\System32\en-US\winload.exe.mui
Please make sure to copy this command exactly as written. You may find it easier to simply copy and paste it directly from here. It also is a good idea to make sure to check what commands work best for your device. Certain models may not be compatible with the same formulas as others.
Granting full control over a file
Completing the previous steps should give you the ownership of the desired file. However, just doing these steps will not automatically give you the ability to delete it. If you want access to deleting the file, you can try to run the calcs command. Doing this will give you full control over the desired file as well as the option to delete it.
Here is an example of the calcs command to claim complete ownership over a file:
cacls C:\Windows\System32\en-US\winload.exe.mui /G {Username}:F
Replace {Username} with your actual username. This will give you full control over the file, allowing you to delete or modify it as needed. Once you have completed these steps, you should have full ownership and access to delete the file. If you encounter any issues, such as permission errors, restarting your computer in Safe Mode can sometimes help. In Safe Mode, Windows operates with minimal drivers and processes, which can allow you to bypass some restrictions that would normally prevent file deletion.
Note: For this example, I was able to overwrite the filename without using Safe Mode. However, your mileage may vary, and you may get a different outcome.
Conclusion
As a reminder, it is not always a good idea to tamper with or delete system files on your Windows 7 or Vista computer. These files are important to the inner workings of your device. You may find it beneficial to try other methods before fully deleting a system file. However, if it is absolutely necessary to do so, then these simple steps may assist you. If you are experiencing issues with this process, please visit the Windows 7 troubleshooting page and check out the question and answer section. If this still does not help you then you may find it easier to visit a local Windows supporting store. A professional may be more helpful in deleting a system file or may even have an alternative you can try.