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Windows Malicious Software Removal Tool 32-bit

Windows Malicious Software Removal Tool (MSRT) helps keep Windows computers free from prevalent malware. MSRT finds and removes threats and reverses the changes made by these threats. MSRT is generally released monthly as part of Windows Update or as a standalone tool available here for download.

Important! Selecting a language below will dynamically change the complete page content to that language.

  • Version:


    Date Published:


    File Name:


    File Size:

    64.2 MB

    KB Articles:


    Use this tool:
    • If you have automatic updates for Windows turned off. Windows Update automatically downloads and runs MSRT in the background.
    • If you suspect an infection from prevalent malware families (see covered threats).
    • To complement your antimalware product. This tool does not replace full-fledged antimalware such as Windows Defender Antivirus.

    MSRT targets prevalent malware families only. For comprehensive malware detection and removal, consider using Microsoft Safety Scanner.

    Integration with automatic updates

    Enable automatic updates to regularly get MSRT with Windows Update. The integrated version automatically runs in the background. If you would like to run MSRT on demand, run the standalone version.

    Release schedule

    Microsoft generally delivers MSRT with Windows Update the second Tuesday of the month. The standalone version available on this page is delivered at the same time.

    Removal results and log file

    After the standalone version of MSRT scans the computer and removes threats, it displays a report that lists the threats. It also generates the following log file:

    %windir%\debug folder\mrt.log

    Information for IT administrators and advanced users (KB890830)

    For advanced information, read KB890830 at

    This KB entry contains information about MSRT and provides links to related topics. Visit this KB entry for more information about:
    • Supported comand-line switches
    • Release information, including the complete list of covered malware families
    • Data collected during errors and detections
    • Removing the tool

    For detailed information about deploying MSRT, IT administrators can read KB891716.

    MSRT blog

    To learn more about the latest MSRT detections, read the posts about MSRT in the Microsoft Malware Protection Center blog.

    Language support

    MSRT supports multiple languages. If the operating system language is not supported, MSRT uses United States English (en-us).
  • Supported Operating Systems

    Windows Server 2008, Windows 10, Windows 7, Windows 8.1, Windows 10 Tech Preview

    Note: This tool must be run with local administrator privileges.
    1. Click the Download button on this page.
    2. Do one of the following:
      • To start the tool immediately after it downloads, click Run.
      • To save the download to your computer for launch later, click Save.
    3. Open the tool to start scanning.

    Note: This tool must be run with local administrator privileges.
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