Error Code 0x00000021

Error Code 0x00000021

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The 0x00000021 or QUOTA_UNDERFLOW error is a Windows Blue Screen of Death (BSOD) error that typically indicates a problem with the allocation of resources to a process. This error may be due to various factors such as issues with the system’s memory, faulty or outdated drivers, or system file corruption.

How to fix:

  1. Update Windows and Drivers: Make sure that your operating system and drivers, especially those related to hardware, are up-to-date. Many BSOD errors, including the QUOTA_UNDERFLOW error, can be caused by outdated system files or drivers.
  2. Check Your Hardware: Faulty or incompatible hardware can lead to this error. Check your hardware for any issues, particularly your computer’s RAM and hard drive.
  3. Perform a Clean Boot: Software conflicts can result in this error. Performing a clean boot can help identify any software that might be causing this issue.
  4. Run System File Checker (SFC): System file corruption can lead to BSOD errors. Running the SFC command can identify and repair corrupt system files. You can do this by opening Command Prompt as an administrator and typing “sfc /scannow”.
  5. Run Windows Memory Diagnostic Tool: Since this error may be related to issues with your computer’s memory, running the Windows Memory Diagnostic tool can help identify and resolve any memory-related issues.
  6. Check for Malware: Some BSOD errors can be caused by malware. Run a comprehensive malware scan on your system using a reliable security tool.

Always remember to back up your important data before making significant changes to your system. If the error persists after following these steps, consider seeking help from a professional or Microsoft Support.

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