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For your system:
Windows 8.1 32-bit
Malicious Software Removal Tool 32-bit
(recommended)
Malicious Software Removal Tool 64-bit
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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.
5.58Windows-KB.58.exe3/13/201837.9 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 ().
To complement your antimalware product. This tool does not replace full-fledged antimalware such as .
MSRT targets prevalent malware families only. For comprehensive malware detection and removal, consider using .
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, .
This KB entry contains information about MSRT and provides links to related topics. Visit this KB entry for more information about:
Supported comand-line switchesRelease information, including the complete list of covered malware familiesData collected during errors and detectionsRemoving the tool
For detailed information about deploying MSRT, IT administrators can .
To learn more about the latest MSRT detections,
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).
System Requirements
Supported Operating System
Windows 10 , Windows 10 Tech Preview , Windows 7, Windows 8, Windows 8.1, Windows Server 2008
Note: This tool must be run with local administrator privileges.
Install Instructions
Click the Download button on this page.
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.
Open the tool to start scanning.
Note: This tool must be run with local administrator privileges.
Related Resources
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