How to fix “Invalid window handle. [ERROR_INVALID_WINDOW_HANDLE (0x578)]” – Error Code 1400

Overview

Error Code 1400, “Invalid window handle. [ERROR_INVALID_WINDOW_HANDLE (0x578)]”, signifies an issue with Windows’ handle management system. This error can arise in various scenarios, hindering program execution or system operations.

Identifying the Problem

Error Code 1400 often arises when:

• An application attempts to access an invalid window handle.
• A window is destroyed while an operation is still pending on its handle.
• A system process encounters an error while managing window handles.

Common Fixes

1. Restart the Application or System

Restarting the affected application or the entire system can resolve temporary issues with window handles.

2. Update Graphics Drivers

Outdated graphics drivers can cause handle errors. Ensure your graphics card drivers are up to date.

3. Run System File Checker (SFC)

SFC helps repair corrupted or missing system files. Open Command Prompt (as Administrator) and run:
sfc /scannow

4. Disable Background Services

Some background services may interfere with handle management. Disable them temporarily using:
msconfig

5. Adjust User Account Control (UAC) Settings

UAC can affect handle permissions. Adjust its settings in Control Panel:
Control Panel\User Accounts\User Accounts Control Settings

Advanced Troubleshooting

1. Debug Window Handling Code

If the issue persists, inspect the application’s window handling code for potential errors or memory leaks.

2. Use Handle Analysis Tools

Windows provides tools like Process Explorer and DebugView to analyze handle usage and identify problematic processes.

3. Modify Registry Settings

Caution is advised when modifying the registry. Adjust the following values:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems\Windows\GlobalFlag
* Set “Win32HeapDeCommitFreeBlockThreshold” to a higher value (e.g., 512).
* Set “Win32HeapDeCommitTotalFreeThreshold” to a higher value (e.g., 1024).

Conclusion

Error Code 1400 can be resolved using the methods outlined above. By following these steps, you can effectively address window handle issues and ensure your system functions smoothly. Additionally, regularly updating software and maintaining a clean system can minimize the occurrence of such errors in the future.