ACL structure invalid

Question

My access control list (ACL) structure is invalid, how can I fix this?

Answer 1

Hi! ACL structure is invalid usually points to a corrupted or malformed permissions list on a file/folder; try these in an elevated Command Prompt:

First repair the image and system files with "DISM /Online /Cleanup-Image /RestoreHealth" then use "sfc /scannow".

If the issue is scoped to a path, take ownership and reset its ACLs with:

takeown /f "Full\Path" /r /d y

Followed by:
icacls "Full\Path" /reset /t /c /l.

If policy corruption is suspected, you can reapply default security settings with:

secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose

And if a stubborn folder persists, remove it from Safe Mode. Back up important data before changes.