Malicious Software Removal Tool
The Microsoft Malicious Software Removal Tool checks computers running Windows 7, Windows Vista, Windows XP, Windows 2000, and Windows Server 2003 for infections by specific, prevalent malicious software—including Blaster, Sasser, and Mydoom—and helps remove any infection found.
When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malware was detected and removed.
New additions
We have added detection and cleaning capabilities for the following malware:
See the complete list of malicious software cleaned by this tool.
Microsoft releases an updated version of this tool on the second Tuesday of each month, and as needed to respond to security incidents. The tool is available from Microsoft Update, Windows Update and the Microsoft Download Center.
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 in the 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.
To download the latest version of this tool, visit the Microsoft Download Center.
You can also perform an online scan of your computer using the Microsoft Safety Scanner.
Get a free safety scan
To scan your computer for malicious and potentially 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.
For real-time protection, download Microsoft Security Essentials.
Protect your PC
To help protect your computer against a wide variety of security threats, see How to boost your malware defense and protect your PC.
Technical assistance
Contact your antivirus vendor for assistance with identifying or removing virus or worm infections. If you need more help with 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.
