Windows defender not updating
Just follow the instructions below: Those are some of the methods you can try to fix Protection Definition Update Failed error code. On the other hand, if you do not want to completely rely on Windows Defender for security, we suggest using a reliable tool like Auslogics Anti-Malware.
This program detects malicious items and keeps your computer safe and secure.
However, it can still be disabled when there is a third-party antivirus installed in the computer.
As such, we advise you to check the dedicated service for Windows Defender and ensure that it is set to start automatically.
Do you have questions about the solutions we provided?
Please check which Fix It applies to your version of Windows. To manually download the latest definition updates for Windows Defender: When the definition file runs, a file extraction dialog box appears.If you notice that Defender itself is misbehaving or stalling, then there are certain steps you should follow.It is true that Windows Defender is a built-in component of the Windows 10 shell.Here are the steps in removing the contents of the Definition folder and the temporary system files: The steps above should initiate a fresh Windows Defender update.Once the process is done, check if the error still persists.