Run and review the results of a Windows Defender Offline scan

Updating windows defender offline

For more information about notifications in

Windows Defender Antivirus gets updates as part of Windows Update. The instructions in this article are intended for beginning computer users or those with more computer experience. This process might also address problems with automatic updates.

The user interface will appear different

You can use Windows Defender Offline if you suspect a malware infection, or you want to confirm a thorough clean of the endpoint after a malware outbreak. Note Before you use Windows Defender Offline, make sure to save any open files and close apps and programs. Automatic updates To help ensure your antimalware solution detects the latest threats, you should always use the latest definitions. If you have multiple sources, enter each source in the order they should be used, separated by a single pipe.

Start Windows Defender if

If you can manually install the update definitions, the problem is most likely caused by a Windows Update problem. The scan is performed outside of the usual Windows operating environment. Your antimalware product should be set to automatically get updates.

For more information about notifications in Windows Defender, see the Configure the notifications that appear on endpoints topic. Start Windows Defender if it is not already open. The user interface will appear different to a normal scan performed by Windows Defender. Alternatively, if Windows Defender determines that Windows Defender Offline needs to run, it will prompt the user on the endpoint.

Definitions allow Windows Defender to detect the latest harmful or unwanted software and prevent it from running on your computer. When you open Windows Defender, you receive a message that states that you should check for new definitions.

The need to perform an offline scan will also be revealed in System Center Configuration Manager if you're using it to manage your endpoints. If you have problems with Windows Update, some other things are occurring that will require advanced troubleshooting. After the scan is completed, the endpoint will be restarted and Windows will load normally.

If you are having problems with Windows Update, use the troubleshooter. The procedures in this article first describe how to set the order, and then how to set up the File share option if you have enabled it.

It will restart the endpoint when the scan is complete. Run a scan Important Before you use Windows Defender Offline, make sure you save any files and shut down running programs.

Alternatively if Windows Defender determines that

Windows Defender Antivirus and other Microsoft antimalware solutions provide a way to manually trigger an update. If you were able to manually install the update definitions, the problem is most likely caused by a Windows Update problem. Enter the file share source.