This event is usually due to an interruption in network connectivity during an update.To troubleshoot this event: The Windows Defender client attempted to download and install the latest definitions file and failed.
This event occurs when the client fails to update itself.
If your system file is corrupt or modified, SFC will replace all core system files.
To run the SFC follow these steps: but also will prevent it from recurring.
This section provides the following information about Windows Defender Antivirus client errors.
original title: Windows Update still giving error Code 8024402F Windows Update encountered an unknown error even after fresh install (Win7 Professional x32 and x64) Hi, I recently installed Windows 7 (fresh install).
Prior to that, I was using Windows Vista and everything was working OK.