Windows Defender Offline Update and Quick Scan (PowerShell Script)

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  • Windows Defender Offline Update and Quick Scan (PowerShell Script)

    Windows Defender Offline Update and Quick Scan (PowerShell Script)

    Category: PowerShell & Command-line Scripts
    Author: Microsoft / PCHF Staff
    Version: 1.2 (October 2025)

    Summary:
    Forces Defender to update signatures and run a quick scan from PowerShell.
    Ideal for repairing Defender update failures or automating endpoint checks.

    Usage:
    Code:
    Update-MpSignature
Start-MpScan -ScanType QuickScan
    Notes:
    • Built into Windows 10 and 11; no extra installation needed.
    • Run as Administrator for system-wide scan.
    • Log location: C:\ProgramData\Microsoft\Windows Defender\Support\.

    Last updated: October 2025 • Verified by PCHF Staff
    Tags: None
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