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To perform a quick Microsoft Defender scan, use these steps: How to perform quick virus scan with Microsoft Defender The -DynamicSignatures option uninstalls only the dynamic signatures.Īfter you complete the steps, the definitions will be removed from your computer according to your configuration. MpCmdRun -RemoveDefinitions -DynamicSignatures Type the following command to remove dynamic signature updates and press Enter: The -Engine option rolls back to the previous version of the antivirus engine. Type the following command to rollback the engine version and press Enter: The -All option restores the previous definitions from the backup or original default set of signatures. Type the following command to remove the most recent definitions and press Enter: You can also remove previously installed updates with these steps: Once you complete the steps, the tool will check and download any update available for the built-in antivirus. Type the following command to check and update Microsoft Defender Antivirus and press Enter: Type the following command to open the antivirus tool location and press Enter:Ĭd C:\ProgramData\Microsoft\Windows Defender\Platform\4.18* Search for Command Prompt, right-click the top result, and select the Run as administrator option.To check and download updates for Microsoft Defender, use these steps: How to check for updates on Microsoft Defender How to restore quarantined items on Microsoft Defender.How to perform boot sector malware scan on Microsoft Defender.