How to fix error error-too-many-tcbs in Windows 11

Solution Steps

1. 1 First, identify which application is causing the error. Open Task Manager by pressing Ctrl+Shift+Esc. Go to the 'Details' tab and look for processes with a high thread count (you can add the 'Threads' column by right-clicking the column headers). Note the process name.
2. 2 Update the problematic application to the latest version. Visit the vendor's website and download the latest update. Often, thread leak bugs are fixed in newer releases.
3. 3 If the application is a game or server, try reducing the number of threads it uses. Look for settings like 'Thread count', 'CPU cores', or 'Multithreading' in the application's options and lower them.
4. 4 Run a system file check: press Windows key + R, type 'sfc /scannow', and press Enter. This repairs corrupted system files that might be causing the issue.
5. 5 If the error persists, you can increase the system's thread limit by editing the registry. Press Windows key + R, type 'regedit', and press Enter. Navigate to 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Executive'. Look for a DWORD value called 'AdditionalCriticalWorkerThreads' or 'AdditionalDelayedWorkerThreads'. If it doesn't exist, right-click, select 'New' > 'DWORD (32-bit) Value', and name it. Set its value to a higher number (e.g., 20). This tells Windows to create more worker threads, which can help. Restart your PC. Note: This is an advanced step; be careful.