PowerTip: Update Windows Defender with PowerShell

PowerTip: Update Windows Defender with PowerShell

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Summary: Use Windows PowerShell cmdlets in Windows 8.1 to update the antivirus definitions.

Hey, Scripting Guy! Question How can I use Windows PowerShell, rather than navigating the GUI, to force updates for Windows Defender?

Hey, Scripting Guy! Answer In Windows 8.1, you can execute the following cmdlet and bring the Windows Defender up to date:

Update-MPSignature

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  • Hey Sean, thank you for sharing this tip. I had completely forgotten about this cmdlet.

  • To Update Defender Automatically , I tried the following steps in windows 8.1 64 bit. But it didn't work for me


    Click START and type TASK and then click on TASK SCHEDULER
    Right click on TASK SCHEDULER LIBRARY and select CREATE NEW BASIC TASK
    Type a name like UPDATE DEFENDER, and click the NEXT button
    Leave the TRIGGER setting to DAILY, and click the NEXT button
    Leave the DAILY setting to RECUR EVERY 1 DAYS, and click the NEXT button
    Leave the ACTION on START A PROGRAM, and click the NEXT button
    In the PROGRAM/SCRIPT field enter: “C:\Program Files\Windows Defender\MpCmdRun.exe” (the quotes ARE required)
    In the ADD ARGUMENTS enter -SignatureUpdate (no quotes), and click the NEXT button
    Click the FINISH button to complete the task
    Double click on the task and select from the GENERAL TAB, select RUN WHETHER USER IS LOGGED IN OR NOT, click OK and enter the password for your account.

    Am I missing anything? Are there any new or alternatives steps or commands for windows 8.1, to updates defender automatically without enabling windows auto update?