If you want to remove a system file in Windows 7, you will be observing that you unable delete system files, even as administrator. This is happen because Windows system files are owned by the TrustedInstaller service by default, and Windows File Protection will keep them from being overwritten.

There is one method using this method you can delete system file. You need to take rights of the files, and after that assign yourself privileges to delete or modify the file.

1. Open an administrator command prompt by typing cmd into the start menu search box, and press the Ctrl+Shift+Enter key combination.

2. To take rights of the file, you’ll need to use the takedown command. Here’s an example:

takeown /f C:\Windows\System32\en-US\winload.exe.mui

3. It will provide you rights of the file, but at rest you don’t have any rights to remove it. For overall rights run the cacls commands then you get the all the rights:

cacls C:\Windows\System32\en-US\winload.exe.mui /G geek:F

4. Currently, you are capable to delete the file. If you still cannot do so, you may require restarting into Safe Mode and trying it again.