This tool doesn't replace your antimalware product. For real-time protection with automatic updates, use Microsoft Defender Antivirus on Windows 11, Windows 10, and Windows 8 or Microsoft Security Essentials on Windows 7. These antimalware products also provide powerful malware removal capabilities. If you're having difficulties removing malware with these products, you can refer to our help on removing difficult threats.
Microsoft generally releases the MSRT on a monthly cadence as part of Windows Update or as a standalone tool. (For exceptions, see Skipped releases.) Use this tool to find and remove specific prevalent threats and reverse the changes that they made (see the "Covered malware families" list in the "Release information" section of KB 890830). For comprehensive malware detection and removal, consider using Windows Defender Offline or Microsoft Safety Scanner.
Because of the switch from ANSI to Unicode, version 1.2 of the removal tool will copy any ANSI versions of the Mrt.log file in the %windir%\debug folder to Mrt.log.old in the same directory. Version 1.2 also creates a new Unicode version of the Mrt.log file in that same directory. Like the ANSI version, this log file will be appended to each month's release.
Q1. When I test my startup or logon script to deploy the tool, I don't see the log files that are being copied to the network share that I set up. Why?
A1. This is frequently caused by permissions issues. For example, the account that the removal tool was run from does not have Write permission to the share. To troubleshoot this, first make sure that the tool ran by checking the registry key. Alternatively, you can look for the presence of the log file on the client computer. If the tool successfully ran, you can test a simple script and make sure that it can write to the network share when it runs under the same security context in which the removal tool was run.
Q2. How do I verify that the removal tool has run on a client computer?
A2. You can examine the value data for the following registry entry to verify the execution of the tool. You can implement such an examination as part of a startup script or a logon script. This process prevents the tool from running multiple times.
Since its January 13, 2005,[2] Microsoft releases the updated tool every second Tuesday of every month (commonly called "Patch Tuesday") through Windows Update, at which point it runs once automatically in the background and reports if malicious software is found. The tool is also available as a standalone download.[1]
In a June 2006 Microsoft report,[2] the company claimed that the tool had removed 16 million instances of malicious software from 5.7 million of 270 million total unique Windows computers since its release in January 2005. The report also stated that, on average, the tool removes malicious software from 1 in every 311 computers on which it runs. On May 19, 2009, Microsoft claimed that the software has removed password stealer threats from 859,842 machines.[7]
Windows Malicious Software Removal Tool helps scan and remove malware from your computer. You can choose to download Windows Malicious Software Removal Tool 64-bit or 32-bit version and use this tool to protect your computer from some prevalent malware/virus.
Windows Malicious Software Removal Tool (MSRT) is a free virus removal tool developed by Microsoft for Windows operating systems. In general, it is included in the Windows system and it can scan and automatically remove prevalent malicious software from your computer.
This post offers a Windows Malicious Software Removal Tool 64-bit or 32-bit download guide. If you need, you can manually download the free MSRT tool from Microsoft Download Center to use this tool to scan and remove malware/viruses on your Windows 10/11 computer.
Microsoft's Malicious Software Removal Tool is a free tool for Windows XP and Vista (and probably Windows 7) which scans computers and removes specific malicious software. It is automatically updated on the second tuesday of every month via Windows Update. You can find it in the in the 'C:\Windows\System32' folder, its name is mrt.exe.
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