Here is a complete list of common Microsoft Defender Antivirus error codes and how to fix them on Windows 11/10 computers.

Citations World Wide Web Consortium (W3C) List of Server Response Codes How Does Google Respond to 500 Response Codes? Watch the discussion at the 13:48 minute mark ...

Players of Call of Duty: Modern Warfare 2 may receive error code 14515 when trying to enter matchmaking. What to know.

If your Windows 11/10 Upgrade has failed & if you have noted down the error code, then this post offers some basic solutions to troubleshoot & resolve the problem.