0x80070091_
System Error � Dir Not Empty
Seeing 0x80070091 on Windows 10/11 means the OS detected "System Error � Dir Not Empty". Before reinstalling anything, work through the steps below — the fix is often simpler than it looks.
What Actually Happened
Windows reported 'the directory is not empty'. This usually traces back to a locked file or broken system permissions.
Symptoms
An application, File Explorer action, or system task fails with error 0x80070091
Common Causes
- The Win32 condition ERROR_DIR_NOT_EMPTY was raised: the directory is not empty
- A file or folder involved in the operation is locked or missing permissions
- System file corruption affecting the component
How to Fix It
-
01
Close processes locking the resource or restart your PC
-
02
Run system repair:
sfc /scannow in an elevated Command Prompt -
03
Verify file/folder permissions under Properties > Security
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Root Cause Breakdown
0x80070091 wraps Win32 error 145 (ERROR_DIR_NOT_EMPTY), indicating the directory is not empty.
Should You Worry?
No inherent risk to your data, but investigate repeated failures.
Power-User Tip
Check Event Viewer (Windows Logs > Application) for timestamp details on 0x80070091.
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