The Microsoft Malicious Software Removal Tool is an anti-malware utility that checks computers running Windows 10 Technical Preview, Windows 8 and Windows 8.1, Windows 7, Windows Vista, Windows XP*, Windows Server 2012 R2 and Windows Server 2012, Windows Server 2008, and Windows Server 2003 for infections by specific, prevalent malicious software—including Blaster, Sasser, and Mydoom—and helps remove malware and any other infections found.
When the detection and malware removal process is complete, the tool displays a report describing the outcome, including which, if any, malware was detected and removed.
*The Malicious Software Removal Tool will continue to be provided for Windows XP through July 14, 2015; it will also continue to be delivered automatically via Windows Update and for download via the Download Center.
See support article KB 890830 for a list of malware cleaned by this tool
Note: The version of the tool delivered by Microsoft Update and Windows Update runs in the background and then reports if a malware infection is found. To run this tool more than once a month, use the version on this web page or install the version that is available at the Microsoft Download Center.
Because computers can appear to function normally when infected, it's a good idea to run this tool regularly even if your computer seems to be fine. You should also use up-to-date antivirus software, such as Microsoft Security Essentials, to help protect your computer from other malware. Windows 8.1 includes antivirus and antispyware software called Windows Defender. Windows Defender for Windows 8 and Windows 8.1 replaces Microsoft Security Essentials.
To scan your computer for malicious and unwanted software, see the Microsoft Safety Scanner.
The Microsoft Safety Scanner is a free downloadable security tool that provides on-demand scanning and helps remove viruses, spyware, and other malware. It works with your existing antivirus software, but is not a replacement for antivirus software.
Contact your anti-malware vendor for assistance with identifying or removing virus or worm infections. If you need more help with malware removal and other virus-related issues, contact Microsoft Support.
If you would prefer to bring your computer to a local repair person or to have someone come to you, use Microsoft Pinpoint to enter your zip code and find a Microsoft partner in your area that can help you remove malware.
For support outside the United States and Canada, visit the Virus and Security Solution Center.
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