Error 0x80004004 in Windows Security is often caused by a failure to update the latest definitions for Microsoft Defender Antivirus.

Because Windows 10 updates the definitions daily, the odds of seeing this error is common and easily resolved. If you have a third-party antivirus, disable that before proceeding.

This video walks you through the steps of updating your Windows Defender Antivirus:



Microsoft Defender Antivirus Error 0x80004004 - Check for Updates

Click Start > Settings > Update & security. Click on Check for Updates.

If the error repeats, reboot, and try again.

Microsoft Defender Antivirus Error 0x80004004 - Manually Update Definition Files

Download the latest Windows Defender Antivirus Definition from MajorGeeks.

Follow the instructions on the download page.

Microsoft Defender Antivirus Error 0x80004004 - Manually Update in Command Prompt

Open Command Prompt or Powershell and type in the following two lines, pressing Enter after each:

cd "Program FilesWindows Defender"

.mpcmdrun.exe -signatureupdate

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