Correcting Windows 11 System File Permissions to Eliminate ‘Parameter is Incorrect’ Errors


“I’m experiencing an issue with my HP Pavilion laptop (15-eg0xxx) running Windows 11 Home, where attempting to open certain files results in a ‘the parameter is incorrect’ error. This problem arose after I modified the permissions of some system files without changing their ownership and then attempted to reset the permissions using the command ‘icacls * /t /q /c /reset’ from the C: directory. Realizing the potential risk, I also executed ‘takeown /F C: /A /R’ to take ownership of the files, which may have compounded the issue. Despite running various repair tools like ‘chkdsk /r’, ‘Dism /Online /Cleanup-Image /ScanHealth’, and ‘sfc /scannow’, the problem persists. Could you provide expert guidance on how to resolve these incorrect parameter errors and restore proper file access?”


The ‘parameter is incorrect’ error on Windows is a common issue that can arise due to various reasons, including improper file permissions or system file corruption. This article provides a comprehensive guide to resolving this error, particularly in cases where permission alterations and ownership changes have led to the problem.


A user with an HP Pavilion laptop (15-eg0xxx) running Windows 11 Home has encountered a ‘parameter is incorrect’ error when opening certain files. The issue began after the user modified system file permissions and attempted a permissions reset using the `icacls` command without changing file ownership. Subsequent ownership changes and permission resets may have exacerbated the problem. Despite running standard repair tools, the error persists.

Understanding the Error:

The ‘parameter is incorrect’ error typically indicates that Windows cannot interpret the file data correctly, often due to permission issues or file corruption. In this case, the error is likely linked to the user’s manual permission changes and the use of the `takeown` command, which can disrupt the default hierarchical structure of file ownership and permissions.

Step-by-Step Resolution Guide:


Revert Ownership and Permissions:

  • Use the `takeown` command to revert ownership to the ‘TrustedInstaller’ for system files.
  • Apply the original permissions using the `icacls` command with the correct syntax to restore default settings.
  • 2.

System File Checker (SFC):

  • Run `sfc /scannow` again to check for and repair any corrupted system files that might not have been detected previously.
  • 3.

Deployment Image Servicing and Management (DISM):

  • Use the `Dism /Online /Cleanup-Image /RestoreHealth` command to repair the Windows image and resolve any underlying issues.
  • 4.

Check Disk Utility (CHKDSK):

  • Execute `chkdsk /f /r` to fix file system errors and recover information from bad sectors.
  • 5.

Create a New User Account:

  • If the issue is isolated to the user profile, creating a new user account may resolve the error.
  • 6.

Perform a System Restore:

  • Use System Restore to revert the system to a state before the permission changes were made.
  • 7.

Reset Windows:

  • As a last resort, consider resetting Windows while keeping personal files intact.


Resolving the ‘parameter is incorrect’ error requires careful attention to the system’s file permissions and ownership. The steps outlined above should help restore proper file access. If the problem persists, it may be necessary to seek professional technical support.


This article is intended for informational purposes only. Modifying system files and permissions can lead to serious system issues. It is recommended to back up important data before proceeding with any of the suggested solutions.

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